Predictors of patients remaining anovulatory during clomiphene citrate induction of ovulation in normogonadotropic oligoamenorrheic infertility - Imani,B.; Eijkemans,M.J.; te Velde,R.E.; Habbema,J.D.; Fauser,B.C. (J Clin Endocrinol Metab, 1998)