C. L. Ogden, M. D. Carroll, L. R. Curtin, et al., “Prevalence of Overweight and Obesity in the United States, 1999-2004,” The Journal of the American Medical Association, Vol. 295, No. 13, 2006, pp. 1549-1555. http://dx.doi.org/10.1001/jama.295.13.1549
 M. A. Maggard, L. R. Shugarman, M. Suttorp, et al., “Meta-Analysis: Surgical Treatment of Obesity,” Annals of Internal Medicine, Vol. 142, No. 7, 2005, pp. 547-559. http://dx.doi.org/10.7326/0003-4819-142-7-200504050-00013
 M. L. Shiffman, H. J. Sugerman, J. H. Kellum, et al., “Gallstones in Patients with Morbid Obesity: Relationship to Body Weight, Weight Loss and Gallbladder Bile Cholesterol Solubility,” International Journal of Obesity and Related Metabolic Disorders, Vol. 17, No. 3, 1993, pp. 153-158.
 U. L. Seinige, D. M. Sataloff, C. P. Lieber, et al., “Gallbladder Disease in the Morbidly Obese Patient,” Obesity Surgery, Vol. 1, No. 1, 1991, pp. 51-56. http://dx.doi.org/10.1381/096089291765561466
 O. C. de Iglezias Brandao, C. E. Adami and B. B. da Silva, “Impact of Rapid Weight Reduction on Risk of Cholelithiasis after Bariatric Surgery,” Obesity Surgery, Vol. 13, No. 4, 2003, pp. 625-628.
 M. L. Shiffman, H. J. Sugerman, J. M. Kellum, et al., “Gallstone Formation after Rapid Weight Loss: A Prospective Study in Patients Undergoing Gastric Bypass Surgery for Treatment of Morbid Obesity,” The American Journal of Gastroenterology, Vol. 86, No. 8, 1991, pp. 1000-1005.
 J. E. Everhart, “Contributions of Obesity and Weight Loss to Gallstone Disease,” Annals of Internal Medicine, Vol. 119, No. 10, 1993, pp. 1029-1035. http://dx.doi.org/10.7326/0003-4819-119-10-1993 11150-00010
 L. Villegas, B. Schneider, D. Provost, et al., “Is Routine Cholecystectomy Required during Laparoscopic Gastric Bypass?” Obesity Surgery, Vol. 14, No. 2, 2004, pp. 206-211.
 D. J. Scott, L. Villegas, T. L. Sims, et al., “Intra-Operative Ultrasound and Prophylactic Ursodiol for Gallstone Prevention Following Laparoscopic Gastric Bypass,” Surgical Endoscopy, Vol. 17, No. 11, 2003, pp. 1796-1802. http://dx.doi.org/10.1007/s00464-002-8930-7
 K. Miller, E. Hell, B. Lang, et al., “Gallstone Formation Prophylaxis after Gastric Restrictive Procedure for Weight Loss: A Randomized Double-Blind Placebo-Controlled Trial,” Annals of Surgery, Vol. 238, No. 5, 2003, pp. 697-702. http://dx.doi.org/10.1097/01.sla.0000094305.77843.cf
 J. H. Schmidt, M. P. Hocking, W. R. Rout, et al., “The Case for Prophylactic Cholecystectomy Concomitant with Gastric Restriction for Morbid Obesity,” The American Surgeon, Vol. 54, No. 5, 1988, pp. 269-272.
 M. Fobi, H. Lee, D. Igwe, et al., “Prophylactic Cholecystectomy with Gastric Bypass Operation: Incidence of Gallbladder Disease,” Obesity Surgery, Vol. 12, No. 3, 2002, pp. 350-353.
 J. Taylor, M. Leitman and M. Horowitz, “Is Routine Cholecystectomy Necessary at the Time of Roux-en-Y Gastric Bypass?” Obesity Surgery, Vol. 16, No. 5, 2006, pp. 759-761. http://dx.doi.org/10. 1381/096089206777346781
 A. Escalona, C. Boza, R. Munoz, et al., “Routine Preoperative Ultrasonography and Selective Cholecystectomy in Laparoscopic Roux-en-Y Gastric Bypass. Why Not?” Obesity Surgery, Vol. 18, No. 1, 2008, pp. 47-51. http://dx.doi.org/10.1007/s11695-007-9262-4
 V. K. Ming Li, N. Pulido, P. Fajnwaks, et al., “Predictors of Gallstone Formation after Bariatric Surgery: A Multivariate Analysis of Risk Factors Comparing Gastric Bypass, Gastric Banding, and Sleeve Gastrectomy,” Surgical Endoscopy, Vol. 23, No. 7, 2009, pp. 1640-1644. http://dx.doi.org/10. 1007/s00464-008-0204-6
 H. Guadalajara, R. S. Baro, I. Pascual, et al., “Is Prophylactic Cholecystectomy Useful in Obese Patients Undergoing Gastric Bypass?” Obesity Surgery, Vol. 16, No. 7, 2006, pp. 883-885.
 D. E. Swartz and E. L. Felix, “Elective Cholecystectomy after Roux-en-Y Gastric Bypass: Why Should Asymptomatic Gallstones Be Treated Differently in Morbidly Obese Patients?” Surgery for Obesity and Related Diseases, Vol. 1, No. 6, 2005, pp. 555-560. http://dx.doi.org/10.1016/j.soard.2005.08.002
 C. I. B. Oliveira, E. A. Chaim and B. B. Silva, “Impact of Rapid Weight Reduction on Risk of Cholelithiasis after Bariatric Surgery,” Obesity Surgery, Vol. 13, No. 4, 2003, pp. 625-628.
 M. L. Shiffman, R. D. Shamburek, C. C. Schwartz, et al., “Gallbladder Mucin, Arachidonic Acid, and Bile Lipids in Patients Who Develop Gallstones during Weight Reduction,” Gastroenterology, Vol. 105, No. 4, 1993, pp. 1200-1208.
 O. N. Tucker, P. Fajnwaks, S. Szomstein, et al., “Is Concomitant Cholecystectomy Necessary in Obese Patients Undergoing Laparoscopic Gastric Bypass Surgery?” Surgical Endoscopy, Vol. 22, No. 11, 2008, pp. 2450-2454. http://dx.doi.org/10.1007/s00464-008-9769-3
 D. D. Portenier, J. P. Grant, H. S. Blackwood., et al., “Expectant Management of the Asymptomatic Gallbladder at Roux-en-Y Gastric Bypass,” Surgery for Obesity and Related Diseases, Vol. 3, No. 4, 2007, pp. 476-479. http://dx.doi.org/10.1016/j.soard.2007.02.006
 P. K. Papasavas, D. J. Gagné, F. A. Ceppa, et al., “Routine Gallbladder Screening Not Necessary in Patients Undergoing Laparoscopic Roux-en-Y Gastric Bypass,” Surgery for Obesity and Related Diseases, Vol. 2, No. 1, 2006, pp. 41-46. http://dx.doi.org/10.1016/j.soard.2005.10.006
 M. C. Uy, M. C. Talingdan-Te, W. Z. Espinosa, et al., “Ursodeoxycholic Acid in the Prevention of Gallstone Formation after Bariatric Surgery: A Meta-Analysis,” Obesity Surgery, Vol. 18, No. 12, 2008, pp. 1532-1538. http://dx.doi.org/10.1007/s11695-008-9587-7
 L. J. Wudel, J. K.Wright, J. P. Debelak, et al., “Prevention of Gallstone Formation in Morbidly Obese Patients Undergoing Rapid Weight Loss: Results of a Randomized Controlled Pilot Study,” Journal of Surgical Research, Vol. 102, No. 1, 2002, pp. 50-56. http://dx.doi.org/10.1006/jsre.2001.6322
 H. Yang, G. M. Peterson, M. P. Roth, L. J. Schoenfield and J. W. Marks, “Risk Factors for Gallstones Formation during Rapid Loss of Weight,” Digestive Diseases and Sciences, Vol. 37, No. 6, 1992, pp. 912-918. http://dx.doi.org/10.1007/BF01300390
 R. M. Kiewiet, M. F. Durian, M. van Leersum, et al., “Gallstone Formation after Weight Loss Following Gastric Banding in Morbidly Obese Dutch Patients,” Obesity Surgery, Vol. 16, No. 5, 2006, pp. 592-596. http://dx.doi.org/10.1381/096089206776945020