Luthra AK, Aggarwal V, Mishra G, Conway J, Evans JA. A Prospective Blinded Study Evaluating the Role of Endoscopic Ultrasound before Endoscopic Retrograde Cholangiopancreatography in the Setting of "Positive" Intraoperative Cholangiogram during Cholecystectomy. Am Surg. 2016 Apr; 82(4):343-7.