1. Department of Internal Medicine 1 of Erlangen University, Erlangen, Germany
2. Department of Internal Medicine, Thuringia Clinic Saalfeld, Saalfeld, Germany
3. Department of Public Health and Primary Care, Trinity College Centre for Health Sciences, Dublin, Ireland
4. Surgical Department of Erlangen University, Erlangen, Germany
5. Radiology Department of Erlangen University, Erlangen, Germany
6. Faculty of Health, University Witten/Herdecke, Erlangen, Germany