Photodynamic therapy with porfimer sodium for ablation of high-grade dysplasia in Barrett's esophagus: international, partially blinded, randomized phase III trial. - Overholt,B.F.; Lightdale,C.J.; Wang,K.K.; Canto,M.I.; Burdick,S.; Haggitt,R.C.; Bronner,M.P.; Taylor,S.L.; Grace,M.G.; Depot,M. (Gastrointest Endosc, 2005)