MatthewsBD, PrattBL, BackusCL, KercherKW, MostafaG, LentznerA, LipfordEH, SingRF, HenifordBT. Effectiveness of the ultrasonic coagulating shears, LigaSure vessel sealer, and surgical clip application in biliary surgery: A comparative analysis. Am Surg2001;67:901–6.