Serum insulin-like growth factor-I in 1030 healthy children, adolescents, and adults: relation to age, sex, stage of puberty, testicular size, and body mass index. - Juul,A.; Bang,P.; Hertel,N.T.; Main,K.; Dalgaard,P.; Jorgensen,K. (J Clin Endocrinol Metab, 1994)