Low serum IGF-I/GH ratio is associated with abnormal glucose tolerance in acromegaly - Fukuoka, H; Takahashi, Y; Iida, K; Kudo, T; Nishizawa, H; Imanaka, M; Takeno, R; Iguchi, G; Takahashi, K; Okimura, Y; Kaji, H; Chihara, K (Horm Res, 2008)