ANDROFERT, Center for Male Reproduction, Av.Dr.Heitor Penteado 1464, Campinas, SP 13075-460, Brazil;
ORIGEN, Center for Reproductive Medicine, Rio de Janeiro, Av.Rodolfo de Amoedo 140, Rio de Janeiro, RJ 22620-330, Brazil;
American Center for Reproductive Medicine, 10681 Carnegie Avenue, X-11, Cleveland.OH 44195, USA;