1. Division of Endocrinology and Metabolism, Department of Medicine III (M.R., G.V., C.M., A.H., A.K.-W., B.L., M.C., A.L.), Medical University of Vienna, A-1090, Vienna, Austria
2. Division of General Surgery, Department of Surgery (S.S.-M., G.P.), Medical University of Vienna, A-1090, Vienna, Austria
3. Division of Clinical Institute of Medical and Chemical Laboratory Diagnostics (O.W.), Medical University of Vienna, A-1090, Vienna, Austria