Insulin-like factor 3 serum levels in 135 normal men and 85 men with testicular disorders: relationship to the luteinizing hormone-testosterone axis - Bay, K; Hartung, S; Ivell, R; Schumacher, M; Jurgensen, D; Jorgensen, N; Holm, M; Skakkebaek, N E; Andersson, A M (J Clin Endocrinol Metab, 2005)