Serum inhibin B in healthy pubertal and adolescent boys: relation to age, stage of puberty, and follicle-stimulating hormone, luteinizing hormone, testosterone, and estradiol levels - Andersson,A.M.; Juul,A.; Petersen,J.H.; Muller,J.; Groome,N.P.; Skakkebaek,N.E. (J Clin Endocrinol Metab, 1997)