Forty-five FtM transsexuals were randomly assigned to receive testoviron depot ( i.m. : 100mg/10 days ; n = 15 ) , testosterone gel ( 50mg/die ; n = 15 ) , and testosterone undecanoate ( i.m. : 1,000 mg every 6 weeks for the first 6 weeks and then every 12 weeks , n = 15 ) .