1. Children's Surgical Research Program, Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Stanford, California.
2. BG-Unfallklinik Ludwigshafen, Department of Plastic- and Handsurgery, University of Heidelberg, Heidelberg, Germany.
3. Dipartimento di Scienze Chirurgiche, Anestesiologiche-Rianimatorie e dell'Emergenza “Giuseppe Zannini,” Universita’ degli Studi di Napoli Federico II, Napoli, Italy.