Prevalence of undiagnosed Type-2-diabetes mellitus and impaired fasting glucose in German primary care: data from the German Metabolic and Cardiovascular Risk Project (GEMCAS) - Hauner, H; Hanisch, J; Bramlage, P; Steinhagen-Thiessen, E; Schunkert, H; Jöckel, K H; Wasem, J; Moebus, S (Exp Clin Endocrinol Diabetes, 2008)