A prospective study of serum insulin-like growth factor I (IGF-I) and IGF-binding protein-3 in 942 healthy infants: associations with birth weight, gender, growth velocity, and breastfeeding - Chellakooty, M; Juul, A; Boisen, K A; Damgaard, I N; Kai, C M; Schmidt, I M; Petersen, J H; Skakkebaek, N E; Main, K M (J Clin Endocrinol Metab, 2006)