title: Clinical trials in male hormonal contraception.
authors.affiliation: Centre of Reproductive Medicine and Andrology of the University, WHO Collaboration Centre for Research in Male Reproduction, Domagkstr. 11, D-48149 Münster/Germany. eberhard.nieschlag@ukmuenster.de
authors.forename: Eberhard
authors.initials: E
authors.lastname: Nieschlag