1. Department of Trauma Hand and Reconstructive Surgery, University Hospital Frankfurt, Frankfurt, Germany;
2. Department of Oral, Cranio-Maxillofacial, and Facial Plastic Surgery, University Hospital Frankfurt, Frankfurt, Germany;
3. Department of Vascular Surgery, Klinikum Darmstadt, Darmstadt, Germany;
4. Department of General and Visceral Surgery, University Hospital Frankfurt, Frankfurt, Germany