1. Department of Otolaryngology-Head and Neck Surgery, Division of Sleep Surgery and Medicine; Tripler Army Medical Center; Honolulu Hawaii U.S.A.
2. College of Medicine; Medical University of South Carolina; Charleston South Carolina U.S.A.
3. Department of Otolaryngology-Head and Neck Surgery, Division of Sleep Surgery and Medicine; Stanford Hospitals and Clinics; Stanford California U.S.A.
4. Department of Otorhinolaryngology/Sleep Medicine Centre; Hospital CUF; Porto Portugal
5. Centre for Research in Health Technologies and Information Systems; University of Porto; Porto Portugal
6. Department of Psychiatry and Behavioral Sciences, Sleep Medicine Division; Stanford Hospital and Clinics; Stanford California U.S.A.