1. Department of Cardiology, West-German Heart Center, University of Essen, Germany.
2. Department of Dermatology and Venerology, University of Essen, Germany.
3. Department of Dermatology, Ruhr-University Bochum, Germany.
4. Department of Internal Medicine, Pneumology and Infectiology, Klinikum Dortmund, Germany.
5. Chair for Medical Management, University Duisburg-Essen, Germany.
6. Center for Clinical Trials (ZKS), University of Leipzig, Germany.