1. Department of Psychiatry, Division of Sleep Medicine, Stanford Hospital and Clinics, Stanford, CA
2. Department of Family and Community Medicine, University of California San Francisco, Fresno, CA
3. Department of Otolaryngology-Head and Neck Surgery, Sleep Surgery Division, Stanford University Medical Center, Stanford, CA
4. Department of Otorhinolaryngology, Hospital Lusiadas - Porto, Portugal; CINTESIS - Center for Research in Health Technologies and Information Systems, University of Porto, Porto, Portugal