A randomized trial of endoscopic balloon dilation and endoscopic sphincterotomy for removal of bile duct stones in patients with a prior Billroth-II gastrectomy. - Bergman,J.; van Berkel,A.M.; Bruno,M.; Fockens,P.; Huibregtse,K.; Rauws,E.; Tijssen,J.; Tygat,G. (Gastrointest Endosc, 2001)