Ovulation induction with gonadotropins and intrauterine insemination compared with in vitro fertilization and no therapy: a prospective, nonrandomized, cohort study and meta-analysis - Peterson, C M; Hatasaka, H H; Jones, K P; Poulson, A M, Jr; Carrell, D T; Urry, R L (Fertil Steril, 1994)