1. Department of Gastroenterology, Hepatology, and EndocrinologyHannover Medical SchoolHannoverGermany
2. Department of Gastroenterology and HepatologyUniversity Hospital EssenEssenGermany
3. Department of Nephrology and HypertensiologyHannover Medical SchoolHannoverGermany
4. Department of Nephrology and HypertensiologyKlinikum BraunschweigBraunschweigGermany
5. Division of General Internal Medicine, Nephrology, and RheumatologyDepartment of Medicine DUniversity Hospital MünsterMünsterGermany