The anticancerogen effects of melatonin, quercetin and luteolin on HepG2 cell lines - Yerer-Aycan, Mukerrem Betul; Aslan, Canan; Imamoglu, Nalan; Kosar, Muberra (Biomedical papers of the Medical Faculty of the University Palacký, Olomouc Czech Republic, 2012)