1. Department of Plastic and Reconstructive Surgery St. Rochus‐Hospital Castrop‐Rauxel Germany
2. Department of Plastic and Reconstructive Surgery, Chang Gung Memorial Hospital Chang Gung University and Medical College Taoyuan City Taiwan
3. Department of Plastic Surgery Freiburg University Medical Center Freiburg Germany
4. Faculty of Medicine Ruhr‐University Bochum Bochum Germany
5. Institute of Pathology, University Hospital Bergmannsheil Ruhr‐University Bochum Bochum Germany
6. Department of Plastic and Reconstructive Surgery Center Hospital of National Center for Global Health and Medicine Tokyo Japan