1. Division of Plastic and Reconstructive Surgery, Department of Surgery, Washington University School of Medicine, St Louis, Missouri
2. Facial Nerve Programme, Regional Paediatric Burns and Plastic Surgery Service, Alder Hey Children’s National Health Service Foundation Trust, Liverpool, England
3. Department of Otorhinolaryngology, La Paz University Hospital, Madrid, Spain
4. Facial Nerve Center, Division of Facial and Plastic and Reconstructive Surgery, Department of Otology and Laryngology, Harvard Medical School and Massachusetts Eye and Ear, Boston
5. Facial Nerve Institute, Division of Plastic and Reconstructive Surgery, Department of Surgery, Washington University School of Medicine, St Louis, Missouri