[1] Karl Landsteiner Univ Hlth Sci, Univ Hosp Krems, Dept Internal Med 2, Krems On The Danube, Austria
[2] Hartberg State Hosp, Dept Internal Med, Hartberg, Austria
[3] Med Univ Graz, Dept Internal Med, Div Nephrol, Graz, Austria
[4] Med Univ Graz, Dept Internal Med, Div Gastroenterol & Hepatol, Auenbruggerpl 15, A-8036 Graz, Austria
[5] Med Univ Graz, Dept Internal Med, Graz, Austria
[6] Med Univ Graz, Dept Internal Med, Div Endocrinol & Diabetol, Graz, Austria