1. Department of Plastic and Reconstructive Surgery, University of Pavia, Pavia, Italy
2. Histology and Embryology Unit, Department of Experimental Medicine, University of Pavia, Pavia, Italy
3. Department Head and Neck Surgery, David Geffen School of Medicine, University of California, Los Angeles
4. now with the Division of Otolaryngology–Head and Neck Surgery, Department of Surgery, City of Hope National Medical Center, Duarte, California