Namtip Srirak A study on women using oral contraceptive with vitamin supplementation, Chiang Mai. Thesis (M.Sc. (Epidemiology))--Mahidol University, 1985. Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/90557
Title
A study on women using oral contraceptive with vitamin supplementation, Chiang Mai