Dehydrocostus lactone enhances tumor necrosis factor-alpha-induced apoptosis of human leukemia HL-60 cells - Oh, G S; Pae, H O; Chung, H T; Kwon, J W; Lee, J H; Kwon, T O; Kwon, S Y; Chon, B H; Yun, Y G (Immunopharmacol Immunotoxicol, 2004)