Acromegaly with Normal Insulin-Like Growth Factor-1 Levels and Congestive Heart Failure as the First Clinical Manifestation - Lee, H M; Lee, S H; Yang, I H; Hwang, I K; Hwang, Y C; Ahn, K J; Chung, H Y; Hwang, H J; Jeong, I K (Endocrinol Metab (Seoul), 2015)