Effects of testosterone enanthate in normal men: experience from a multicenter contraceptive efficacy study**Supported by the United Nations Development Programme/United Nations Fund for Population/World Health Organization/World Bank Special Programme of Research, Development and Research Training in Human Reproduction, and by the U.S. Agency for International Development through the Contraceptive Research and Development (CONRAD) program, contract CSA-88-024 to the United States center, University of Washington, Seattle, Washington.