IGF-I, IGF binding protein (IGFBP)-3, phosphoisoforms of IGFBP-1, and postnatal growth in very low birth weight infants - Kajantie, E; Dunkel, L; Rutanen, E M; Seppälä, M; Koistinen, R; Sarnesto, A; Andersson, S (J Clin Endocrinol Metab, 2002)