Apoptotic activity of caged xanthones from Garcinia hanburyi in cholangiocarcinoma cell lines - Hahnvajanawong, C; Boonyanugomol, W; Nasomyon, T; Loilome, W; Namwat, N; Anantachoke, N; Tassaneeyakul, W; Sripa, B; Namwat, W; Reutrakul, V (World J Gastroenterol, 2010)