Combined transdermal testosterone gel and the progestin nestorone suppresses serum gonadotropins in men. - Mahabadi V; Amory JK; Swerdloff RS; Bremner WJ; Page ST; Sitruk-Ware R; Christensen PD; Kumar N; Tsong YY; Blithe D; Wang C (The Journal of clinical endocrinology and metabolism, 2009)