1. Facial Nerve Center, Department of Otolaryngology; Massachusetts Eye and Ear Infirmary and Harvard Medical School; Boston Massachusetts U.S.A
2. Healthy Science School; University of Brasilia; Brasilia Brazil
3. Department of Plastic Surgery; University Medical Center Groningen and University of Groningen; Groningen the Netherlands
4. Department of Plastic and Reconstructive Surgery; Royal Australasian College of Surgeons and University of Sydney; Sydney Australia