1. Microvascular Research Laboratory; Department of Orthopedic Surgery, Mayo Clinic; 200 First Street SW Rochester Minnesota
2. Department of Hand-, Plastic- and Reconstructive Surgery, -Burn Center-, BG Trauma Center Ludwigshafen; Department of Plastic Surgery, University of Heidelberg; Heidelberg Germany
3. Department of Plastic, Reconstructive and Hand Surgery; Erasmus Medical Center; Rotterdam The Netherlands