1. Department of Internal Medicine 3 - Rheumatology and Immunology; Friedrich-Alexander-University Erlangen-Nürnberg (FAU); Universitätsklinikum Erlangen; Erlangen Germany
2. Department of Internal Medicine 1 - Gastroenterology, Pulmonology and Endocrinology; Friedrich-Alexander-University Erlangen-Nürnberg (FAU); Universitätsklinikum Erlangen; Erlangen Germany
3. Institute of Clinical Chemistry and Laboratory Medicine; University Medical Center Hamburg-Eppendorf; Hamburg Germany