1. Medicine IV, University Hospital Tübingen, Tübingen, Germany
2. Zentrum für Innere Medizin, Marien Hospital Stuttgart, Stuttgart, Germany
3. Medicine 1, Uniklinikum Aaachen, Aachen, Germany
4. Dept. Medicine 1, Universitätsklinikum Würzburg, Wurzburg, Germany
5. Augenklinik, University Hospital Leipzig, Leipzig, Germany