Variants of the Transcription Factor 7-Like 2 Gene (TCF7L2) are Strongly Associated with Type 2 Diabetes but not with the Metabolic Syndrome in the MONICA/KORA Surveys - Marzi, C; Huth, C; Kolz, M; Grallert, H; Meisinger, C; Wichmann, H -E; Rathmann, W; Herder, C; Illig, T (Hormone and Metabolic Research, 2007)