A Placebo-Controlled Double-Blind Crossover Investigation of the Side Effects Attributed to Oral Contraceptives*†*Presented at the Twenty-Seventh Annual Meeting of the American Fertility Society, New Orleans, Louisiana, March 25–27, 1971.†This work was supported by a grant from Syntex Corp., Palo Alto, California, and by the Agency for International Development, United States Department of State, Contract AIDcsd/2821.