Task Force on Oral ContraceptivesS. KoetsawangO. KiriwatA. ShethV. ChoudharyK. HazariJ. JoshiS. MehtaK. VirkarA. N. GuptaV. AimakhuMrs G. DelanoO. LadipoO. OjoL. AndolsekMajda KustrinT. K. ChatterjeeMrs L. NilesD. S.O. WachaR. ApeloJ. LopezS. C. ChewS. S. RatnamL. KovacsS. ZalanyiAndras TekulicsM. A. BelseyP. E. HallR. A. ParkerO. AyeniA. PinolC. Li Hoi FooOrganisation Mondiale de la SanteMahidol UniversityInstitute for Research in Reproduction IndiaPostgraduate Institute of Medical Education and ResearchUniversity of IbadanUniverzitetni Klinicni Center LjubljanaUniversity of ZambiaUniversity of the Philippines ManilaHospital Jose Joaquin AguirreNational University of SingaporeUniversity of Szeged Faculty of Medicine2018-10-122018-10-121982-01-01Contraception. Vol.25, No.3 (1982), 231-241001078242-s2.0-0020053181https://repository.li.mahidol.ac.th/handle/20.500.14594/30410Mahidol UniversityMedicineA randomized, double-blind study of six combined oral contraceptivesArticleSCOPUS10.1016/0010-7824(82)90046-4