Due to restrictions following results are derived from synthetic data to demonstrate capability of Computational Healthcare. Please do no derive any inferences from results below.

Exclusions
Order Criteria Count
Total 11280
Excluded - 130
Selected 11010
Selected Pediatric 130
2 Age < 0 - 130
Admission source preceding procedure
Pediatric Initial Median ΔT days Count All
False Routine admission (N1_r) 1 1820 view
False Admission via ED (N1_e) 1 1780 view
False Transferred in from Hospital (N1_h) 1 1810 view
False Admission all sources (N1_a) 1 11010 view
True Admission all sources (N1_a) 1 130 view
Disposition destination following procedure
Pediatric Subsequent Median ΔT days Count All
False Discharge, Transferred or Died (N1_x) 1 11010 view
False Discharged or Transferred alive (N1_d) 1 10990 view
False Discharged to Home Health Care (N1_c) 4 300 view
False Discharged to home (N1_f) 1 10380 view
True Discharge, Transferred or Died (N1_x) 1 130 view
True Discharged or Transferred alive (N1_d) 1 130 view
True Discharged to home (N1_f) 1 130 view
Procedures Preceding Laparoscopic cholecystectomy (P5123)
Pediatric Initial Median ΔT days Count All
False Transfusion of packed cells (P9904) 1 120 view
False Computerized axial tomography of abdomen (P8801) 1 180 view
False Esophagogastroduodenoscopy [EGD] with closed biopsy (P4516) 1 130 view
False Endoscopic retrograde cholangiopancreatography [ERCP] (P5110) 1 160 view
False Laparoscopic liver biopsy (P5014) 0 100 view
False Intraoperative cholangiogram (P8753) 0 2950 view
False Endoscopic removal of stone(s) from biliary tract (P5188) 1 810 view
False Laparoscopic lysis of peritoneal adhesions (P5451) 0 490 view
False Venous catheterization, not elsewhere classified (P3893) 2 140 view
False Endoscopic insertion of stent (tube) into bile duct (P5187) 1 240 view
False Other open umbilical herniorrhaphy (P5349) 0 180 view
False Diagnostic ultrasound of abdomen and retroperitoneum (P8876) 1 310 view
False Endoscopic sphincterotomy and papillotomy (P5185) 1 1070 view
False Laparoscopic gastroenterostomy (P4438) 0 190 view
Procedures followed by Laparoscopic cholecystectomy (P5123)
Pediatric Subsequent Median ΔT days Count All
False Laparoscopic gastroenterostomy (P4438) 0 190 view
False Endoscopic sphincterotomy and papillotomy (P5185) 1 510 view
False Laparoscopic lysis of peritoneal adhesions (P5451) 0 490 view
False Venous catheterization, not elsewhere classified (P3893) 1 100 view
False Other open umbilical herniorrhaphy (P5349) 0 180 view
False Laparoscopic liver biopsy (P5014) 0 100 view
False Endoscopic removal of stone(s) from biliary tract (P5188) 1 400 view
False Endoscopic insertion of stent (tube) into bile duct (P5187) 1 120 view
False Transfusion of packed cells (P9904) 1 180 view
False Intraoperative cholangiogram (P8753) 0 2940 view
Grouped entries by Laparoscopic cholecystectomy (P5123) with specific Diagnosis or DRG
Pediatric Diagnosis Code Initial Code Subsequent Code Diagnosis Initial Subsequent Median ΔT days Count All
False D57470 N1_a P5123 Calculus of gallbladder and bile duct with other cholecystitis, without mention of obstruction Admission all sources Laparoscopic cholecystectomy 2 210 view
False D57470 P5185 P5123 Calculus of gallbladder and bile duct with other cholecystitis, without mention of obstruction Endoscopic sphincterotomy and papillotomy Laparoscopic cholecystectomy 1 120 view
False D57470 P5123 N1_d Calculus of gallbladder and bile duct with other cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharged or Transferred alive 2 210 view
False D57470 P5188 P5123 Calculus of gallbladder and bile duct with other cholecystitis, without mention of obstruction Endoscopic removal of stone(s) from biliary tract Laparoscopic cholecystectomy 1 100 view
False D57470 P5123 N1_x Calculus of gallbladder and bile duct with other cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharge, Transferred or Died 2 210 view
False D57470 P5123 N1_f Calculus of gallbladder and bile duct with other cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharged to home 2 210 view
False D57512 P5123 N1_x Acute and chronic cholecystitis Laparoscopic cholecystectomy Discharge, Transferred or Died 1 100 view
False D57512 N1_a P5123 Acute and chronic cholecystitis Admission all sources Laparoscopic cholecystectomy 1 100 view
False D57512 P5123 N1_d Acute and chronic cholecystitis Laparoscopic cholecystectomy Discharged or Transferred alive 1 100 view
False D5770 P5123 N1_f Acute pancreatitis Laparoscopic cholecystectomy Discharged to home 1 850 view
False D5770 P5185 P5123 Acute pancreatitis Endoscopic sphincterotomy and papillotomy Laparoscopic cholecystectomy 1 150 view
False D5770 N1_r P5123 Acute pancreatitis Routine admission Laparoscopic cholecystectomy 3 130 view
False D5770 P5123 N1_d Acute pancreatitis Laparoscopic cholecystectomy Discharged or Transferred alive 1 890 view
False D5770 P8753 P5123 Acute pancreatitis Intraoperative cholangiogram Laparoscopic cholecystectomy 0 320 view
False D5770 N1_h P5123 Acute pancreatitis Transferred in from Hospital Laparoscopic cholecystectomy 2 140 view
False D5770 N1_e P5123 Acute pancreatitis Admission via ED Laparoscopic cholecystectomy 3 140 view
False D5770 P5123 P8753 Acute pancreatitis Laparoscopic cholecystectomy Intraoperative cholangiogram 0 320 view
False D5770 P5123 N1_x Acute pancreatitis Laparoscopic cholecystectomy Discharge, Transferred or Died 1 890 view
False D5770 P5188 P5123 Acute pancreatitis Endoscopic removal of stone(s) from biliary tract Laparoscopic cholecystectomy 1 100 view
False D5770 N1_a P5123 Acute pancreatitis Admission all sources Laparoscopic cholecystectomy 3 890 view
False D27801 P4438 P5123 Morbid obesity Laparoscopic gastroenterostomy Laparoscopic cholecystectomy 0 130 view
False D27801 P5123 N1_f Morbid obesity Laparoscopic cholecystectomy Discharged to home 2 180 view
False D27801 P5123 P4438 Morbid obesity Laparoscopic cholecystectomy Laparoscopic gastroenterostomy 0 130 view
False D27801 P5123 N1_d Morbid obesity Laparoscopic cholecystectomy Discharged or Transferred alive 2 180 view
False D27801 N1_a P5123 Morbid obesity Admission all sources Laparoscopic cholecystectomy 0 180 view
False D27801 P5123 N1_x Morbid obesity Laparoscopic cholecystectomy Discharge, Transferred or Died 2 180 view
False D57511 P5123 N1_x Chronic cholecystitis Laparoscopic cholecystectomy Discharge, Transferred or Died 1 130 view
False D57511 P5123 N1_d Chronic cholecystitis Laparoscopic cholecystectomy Discharged or Transferred alive 1 130 view
False D57511 P5123 N1_f Chronic cholecystitis Laparoscopic cholecystectomy Discharged to home 1 120 view
False D57511 N1_a P5123 Chronic cholecystitis Admission all sources Laparoscopic cholecystectomy 0 130 view
False D57400 P5451 P5123 Calculus of gallbladder with acute cholecystitis, without mention of obstruction Laparoscopic lysis of peritoneal adhesions Laparoscopic cholecystectomy 0 120 view
False D57400 N1_r P5123 Calculus of gallbladder with acute cholecystitis, without mention of obstruction Routine admission Laparoscopic cholecystectomy 1 520 view
False D57400 N1_h P5123 Calculus of gallbladder with acute cholecystitis, without mention of obstruction Transferred in from Hospital Laparoscopic cholecystectomy 1 530 view
False D57400 N1_a P5123 Calculus of gallbladder with acute cholecystitis, without mention of obstruction Admission all sources Laparoscopic cholecystectomy 1 3250 view
False D57400 P5123 P8753 Calculus of gallbladder with acute cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Intraoperative cholangiogram 0 740 view
False D57400 P5123 N1_x Calculus of gallbladder with acute cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharge, Transferred or Died 1 3250 view
False D57400 P5123 P5451 Calculus of gallbladder with acute cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Laparoscopic lysis of peritoneal adhesions 0 120 view
False D57400 P5123 N1_d Calculus of gallbladder with acute cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharged or Transferred alive 1 3250 view
False D57400 N1_e P5123 Calculus of gallbladder with acute cholecystitis, without mention of obstruction Admission via ED Laparoscopic cholecystectomy 1 540 view
False D57400 P5123 N1_f Calculus of gallbladder with acute cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharged to home 1 3180 view
False D57400 P8876 P5123 Calculus of gallbladder with acute cholecystitis, without mention of obstruction Diagnostic ultrasound of abdomen and retroperitoneum Laparoscopic cholecystectomy 1 120 view
False D57400 P8753 P5123 Calculus of gallbladder with acute cholecystitis, without mention of obstruction Intraoperative cholangiogram Laparoscopic cholecystectomy 0 740 view
False D57420 P5123 N1_f Calculus of gallbladder without mention of cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharged to home 1 380 view
False D57420 P5123 N1_d Calculus of gallbladder without mention of cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharged or Transferred alive 1 390 view
False D57420 P5123 N1_x Calculus of gallbladder without mention of cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharge, Transferred or Died 1 390 view
False D57420 N1_a P5123 Calculus of gallbladder without mention of cholecystitis, without mention of obstruction Admission all sources Laparoscopic cholecystectomy 0 390 view
False D57461 N1_a P5123 Calculus of gallbladder and bile duct with acute cholecystitis, with obstruction Admission all sources Laparoscopic cholecystectomy 2 100 view
False D57461 P5123 N1_d Calculus of gallbladder and bile duct with acute cholecystitis, with obstruction Laparoscopic cholecystectomy Discharged or Transferred alive 2 100 view
False D57461 P5123 N1_x Calculus of gallbladder and bile duct with acute cholecystitis, with obstruction Laparoscopic cholecystectomy Discharge, Transferred or Died 2 100 view
False DG494 P5123 P8753 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Laparoscopic cholecystectomy Intraoperative cholangiogram 0 1420 view
False DG494 P5123 P5188 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Laparoscopic cholecystectomy Endoscopic removal of stone(s) from biliary tract 1 170 view
False DG494 P5451 P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Laparoscopic lysis of peritoneal adhesions Laparoscopic cholecystectomy 0 210 view
False DG494 P5123 P5185 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Laparoscopic cholecystectomy Endoscopic sphincterotomy and papillotomy 1 220 view
False DG494 P5185 P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Endoscopic sphincterotomy and papillotomy Laparoscopic cholecystectomy 1 350 view
False DG494 P8876 P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Diagnostic ultrasound of abdomen and retroperitoneum Laparoscopic cholecystectomy 1 150 view
False DG494 N1_a P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Admission all sources Laparoscopic cholecystectomy 0 5460 view
False DG494 N1_h P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Transferred in from Hospital Laparoscopic cholecystectomy 0 900 view
False DG494 P5188 P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Endoscopic removal of stone(s) from biliary tract Laparoscopic cholecystectomy 1 250 view
False DG494 P5123 P5451 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Laparoscopic cholecystectomy Laparoscopic lysis of peritoneal adhesions 0 210 view
False DG494 P8753 P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Intraoperative cholangiogram Laparoscopic cholecystectomy 0 1430 view
False DG494 N1_e P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Admission via ED Laparoscopic cholecystectomy 0 870 view
False DG494 P5123 N1_d DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Laparoscopic cholecystectomy Discharged or Transferred alive 1 5460 view
False DG494 N1_r P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Routine admission Laparoscopic cholecystectomy 0 880 view
False DG494 P5123 N1_f DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Laparoscopic cholecystectomy Discharged to home 1 5400 view
False DG494 P5123 N1_x DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W/O CC Laparoscopic cholecystectomy Discharge, Transferred or Died 1 5460 view
False DG493 N1_a P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Admission all sources Laparoscopic cholecystectomy 1 4410 view
False DG493 P5123 P5188 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Laparoscopic cholecystectomy Endoscopic removal of stone(s) from biliary tract 1 200 view
False DG493 P5187 P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Endoscopic insertion of stent (tube) into bile duct Laparoscopic cholecystectomy 1 160 view
False DG493 P5451 P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Laparoscopic lysis of peritoneal adhesions Laparoscopic cholecystectomy 0 210 view
False DG493 P8876 P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Diagnostic ultrasound of abdomen and retroperitoneum Laparoscopic cholecystectomy 2 150 view
False DG493 N1_h P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Transferred in from Hospital Laparoscopic cholecystectomy 2 710 view
False DG493 P5123 N1_c DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Laparoscopic cholecystectomy Discharged to Home Health Care 4 200 view
False DG493 P8753 P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Intraoperative cholangiogram Laparoscopic cholecystectomy 0 1300 view
False DG493 P5123 P9904 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Laparoscopic cholecystectomy Transfusion of packed cells 1 120 view
False DG493 P5188 P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Endoscopic removal of stone(s) from biliary tract Laparoscopic cholecystectomy 1 500 view
False DG493 P5123 P5185 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Laparoscopic cholecystectomy Endoscopic sphincterotomy and papillotomy 1 250 view
False DG493 P5123 P5451 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Laparoscopic cholecystectomy Laparoscopic lysis of peritoneal adhesions 0 210 view
False DG493 P5185 P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Endoscopic sphincterotomy and papillotomy Laparoscopic cholecystectomy 1 650 view
False DG493 N1_e P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Admission via ED Laparoscopic cholecystectomy 2 720 view
False DG493 P5123 N1_x DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Laparoscopic cholecystectomy Discharge, Transferred or Died 2 4410 view
False DG493 P5123 P8753 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Laparoscopic cholecystectomy Intraoperative cholangiogram 0 1290 view
False DG493 P5123 N1_f DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Laparoscopic cholecystectomy Discharged to home 2 4010 view
False DG493 N1_r P5123 DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Routine admission Laparoscopic cholecystectomy 2 740 view
False DG493 P5123 N1_d DRG V24 : LAPAROSCOPIC CHOLECYSTECTOMY W/O C.D.E. W CC Laparoscopic cholecystectomy Discharged or Transferred alive 2 4400 view
False DG288 N1_a P5123 DRG V24 : O.R. PROCEDURES FOR OBESITY Admission all sources Laparoscopic cholecystectomy 0 220 view
False DG288 P4438 P5123 DRG V24 : O.R. PROCEDURES FOR OBESITY Laparoscopic gastroenterostomy Laparoscopic cholecystectomy 0 190 view
False DG288 P5123 N1_d DRG V24 : O.R. PROCEDURES FOR OBESITY Laparoscopic cholecystectomy Discharged or Transferred alive 2 220 view
False DG288 P5123 N1_f DRG V24 : O.R. PROCEDURES FOR OBESITY Laparoscopic cholecystectomy Discharged to home 2 220 view
False DG288 P5123 P4438 DRG V24 : O.R. PROCEDURES FOR OBESITY Laparoscopic cholecystectomy Laparoscopic gastroenterostomy 0 190 view
False DG288 P5123 N1_x DRG V24 : O.R. PROCEDURES FOR OBESITY Laparoscopic cholecystectomy Discharge, Transferred or Died 2 220 view
False D5750 P5123 N1_d Acute cholecystitis Laparoscopic cholecystectomy Discharged or Transferred alive 2 470 view
False D5750 N1_a P5123 Acute cholecystitis Admission all sources Laparoscopic cholecystectomy 1 470 view
False D5750 P5123 N1_f Acute cholecystitis Laparoscopic cholecystectomy Discharged to home 1 450 view
False D5750 P5123 N1_x Acute cholecystitis Laparoscopic cholecystectomy Discharge, Transferred or Died 2 470 view
False D5750 N1_r P5123 Acute cholecystitis Routine admission Laparoscopic cholecystectomy 1 100 view
False D57460 P5123 N1_f Calculus of gallbladder and bile duct with acute cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharged to home 2 190 view
False D57460 P5123 N1_d Calculus of gallbladder and bile duct with acute cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharged or Transferred alive 2 190 view
False D57460 P5123 N1_x Calculus of gallbladder and bile duct with acute cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharge, Transferred or Died 2 190 view
False D57460 N1_a P5123 Calculus of gallbladder and bile duct with acute cholecystitis, without mention of obstruction Admission all sources Laparoscopic cholecystectomy 2 190 view
False DG578 P5123 N1_f DRG V24 : INFECTIOUS & PARASITIC DISEASES W O.R. PROCEDURE Laparoscopic cholecystectomy Discharged to home 2 130 view
False DG578 P5123 N1_x DRG V24 : INFECTIOUS & PARASITIC DISEASES W O.R. PROCEDURE Laparoscopic cholecystectomy Discharge, Transferred or Died 4 220 view
False DG578 N1_a P5123 DRG V24 : INFECTIOUS & PARASITIC DISEASES W O.R. PROCEDURE Admission all sources Laparoscopic cholecystectomy 3 220 view
False DG578 P5123 N1_d DRG V24 : INFECTIOUS & PARASITIC DISEASES W O.R. PROCEDURE Laparoscopic cholecystectomy Discharged or Transferred alive 4 220 view
False D57401 P5123 N1_d Calculus of gallbladder with acute cholecystitis, with obstruction Laparoscopic cholecystectomy Discharged or Transferred alive 1 230 view
False D57401 P5123 N1_f Calculus of gallbladder with acute cholecystitis, with obstruction Laparoscopic cholecystectomy Discharged to home 1 230 view
False D57401 N1_a P5123 Calculus of gallbladder with acute cholecystitis, with obstruction Admission all sources Laparoscopic cholecystectomy 1 230 view
False D57401 P5123 N1_x Calculus of gallbladder with acute cholecystitis, with obstruction Laparoscopic cholecystectomy Discharge, Transferred or Died 1 230 view
False D57480 N1_a P5123 Calculus of gallbladder and bile duct with acute and chronic cholecystitis, without mention of obstruction Admission all sources Laparoscopic cholecystectomy 2 130 view
False D57480 P5123 N1_f Calculus of gallbladder and bile duct with acute and chronic cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharged to home 2 120 view
False D57480 P5123 N1_d Calculus of gallbladder and bile duct with acute and chronic cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharged or Transferred alive 2 130 view
False D57480 P5123 N1_x Calculus of gallbladder and bile duct with acute and chronic cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharge, Transferred or Died 2 130 view
False D57410 P5123 N1_x Calculus of gallbladder with other cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharge, Transferred or Died 1 1770 view
False D57410 P5123 P8753 Calculus of gallbladder with other cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Intraoperative cholangiogram 0 490 view
False D57410 P5123 N1_f Calculus of gallbladder with other cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharged to home 1 1740 view
False D57410 N1_e P5123 Calculus of gallbladder with other cholecystitis, without mention of obstruction Admission via ED Laparoscopic cholecystectomy 0 290 view
False D57410 P5123 N1_d Calculus of gallbladder with other cholecystitis, without mention of obstruction Laparoscopic cholecystectomy Discharged or Transferred alive 1 1770 view
False D57410 N1_a P5123 Calculus of gallbladder with other cholecystitis, without mention of obstruction Admission all sources Laparoscopic cholecystectomy 0 1770 view
False D57410 N1_h P5123 Calculus of gallbladder with other cholecystitis, without mention of obstruction Transferred in from Hospital Laparoscopic cholecystectomy 0 270 view
False D57410 N1_r P5123 Calculus of gallbladder with other cholecystitis, without mention of obstruction Routine admission Laparoscopic cholecystectomy 0 300 view
False D57410 P8753 P5123 Calculus of gallbladder with other cholecystitis, without mention of obstruction Intraoperative cholangiogram Laparoscopic cholecystectomy 0 490 view