1. Rostock University Medical Center, Rostock, Germany
2. University of Rostock, Rostock, Germany
3. Charité Campus Virchow-Klinikum, Berlin, Germany
4. University Hospital Halle, Halle (Saale), Germany
5. Carl-von-Basedow-Klinikum, Merseburg, Germany
6. Heinrich Braun Klinikum Zwickau, Zwickau, Germany
7. University Medicine Greifswald, Greifswald, Germany