Affiliation: | (1) WHO Collaborating Centre for Research and Training in Human Reproduction, Experimental Biology Unit, All Indian Institute of Medical Sciences, 110 029 New Delhi;(2) Present address: Institute for Research in Reproduction, Jehangir Merwanji Street, Parel, 400 012 Bombay;(3) Present address: Special Programme of Research on Human Reproduction, World Health Organisation, 1211 Geneva 27, Switzerland |