1. Department of Plastic, Hand, and Reconstructive Surgery, University Hospital Regensburg, Regensburg, Germany
2. Department of Anesthesiology, University Hospital Regensburg, Regensburg, Germany
3. Department of Hand, Plastic and Reconstructive Surgery, Burn Trauma Center, BG Trauma Center Ludwigshafen, University of Heidelberg, Ludwigshafen, Germany