Insulin action and secretion in healthy, glucose tolerant first degree relatives of patients with type 2 diabetes mellitus. Influence of body weight. - Volk,A.; Renn,W.; Overkamp,D.; Mehnert,B.; Maerker,E.; Jacob,S.; Balletshofer,B.; Häring,H.U.; Rett,K. (Exp Clin Endocrinol Diabetes, 1999)