Normal human follicle development: an evaluation of correlations with oestradiol, androstenedione and progesterone levels in individual follicles - van Dessel,J.H.; Schipper,I.; Pache,T.D.; van Geldorp,H.; de Jong,H.F.; Fauser,B.C. (Clin Endocrinol (Oxf), 1996)