Percutaneous transhepatic cholangioscopic treatment for hepatolithiasis: an evaluation of long-term results and risk factors for recurrence. - Lee,S.K.; Seo,D.W.; Myung,S.J.; Park,E.T.; Lim,B.C.; Kim,H.J.; Yoo,K.S.; Park,H.J.; Joo,Y.H.; Kim,M.H.; Min,Y.I. (Gastrointest Endosc, 2001)