1 Sleep Laboratory, Division of Sleep and Pulmonary Medicine, Bethesda North Hospital, Cincinnati, Ohio.
2 University of Cincinnati, Cincinnati, Ohio.
3 Ohio University Medical School, Columbus, Ohio.
4 Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, New Mexico.
5 University of New Mexico Sleep Disorders Center, Albuquerque, New Mexico.
6 Department of Electrical and Computer Engineering, University of New Mexico School of Engineering, Albuquerque, New Mexico.
7 Division of Pulmonary Critical Care and Sleep, Ohio State University, Columbus, Ohio.