1. Sleep Medicine Section, Veterans Affairs San Diego Healthcare System, San Diego, California, United States
2. Division of Pulmonary, Critical Care, Sleep Medicine and Physiology, University of California, San Diego, California, United States
3. Division of Sleep and Circadian Disorders, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts, United States
4. Section of Endocrinology, Yale School of Medicine, New Haven, Connecticut, United States