1. Children's Surgical Research Program, Department of Surgery, Stanford University School of Medicine, Stanford, California.
2. Department of Structural and Functional Biology, University of Naples Federico II, Complesso M.S. Angelo, Napoli, Italy.
3. BG-Unfallklinik Ludwigshafen, Department of Plastic-and Handsurgery of the University of Heidelberg, Heidelberg, Germany.