1. CINTESIS (Center for Research in Health Technologies and Information Systems); University of Porto; Porto Portugal
2. Department of Otorhinolaryngology/Sleep Medicine Center; Hospital CUF and Hospital Sao Sebastiao; Porto Portugal
3. Department of Otorhinolaryngology; Grupo Medico San Pedro; Monterrey Mexico
4. Department of Otolaryngology; Division of Sleep Surgery and Medicine; China Medical University Hospital; Taichung Taiwan
5. Department of Otolaryngology; Division of Sleep Surgery and Medicine; Tripler Army Medical Center; Honolulu Hawaii
6. Sleep Surgery Division; Department of Otolaryngology-Head and Neck Surgery; Stanford University School of Medicine; Stanford California U.S.A