1. 1st Department of Internal Medicine, University Medical Centre Mainz, Germany and Department of Internal Medicine, St. Mary’s Hospital, Frankfurt, Germany
2. Comprehensive School Mainz-Bretzenheim, Mainz, Germany
3. Department of Internal Medicine, St. Mary’s Hospital, Frankfurt, Germany
4. Department of Anaesthesiology, University Medical Center Mainz, Mainz, Germany
5. Institute for Medical Biostatistics, Epidemiology and Informatics, University Medical Center Mainz, Mainz, Germany