Green tea catechin epigallocatechin gallate causes apoptosis and shows potential synergism with cisplatin in biliary tract cancer cells - Mayr, C; Wagner, A; Neureiter, D; Pichler, M; Ritter, M; Illig, R; Berr, F; Kiesslich, T (Zeitschrift für Gastroenterologie, 2015)