1. Division of Pulmonary, Critical Care and Sleep MedicineUniversity of California San DiegoLa Jolla, California
2. Division of Allergy, Pulmonary, Critical Care, and Sleep MedicineBoston University School of MedicineBoston, Massachusetts
3. Division of Sleep MedicineUniversity of PennsylvaniaPhiladelphia, Pennsylvania
4. Corporal Michael J. Crescenz VA Medical CenterPhiladelphia, Pennsylvania
5. Cleveland Clinic Sleep Disorders CenterCleveland, Ohio