Funding for this research was provided by:
National Institute of Mental health (MH079179)
Periodic Breathing Foundation (Foundation grant)
Sleep Research Society Foundation (Elliot D. Weitzman, MD, Research Grant)
National Institute of Neurological Disorders and Stroke (NS055813)
U.S. Department of Veteran Affairs (Shared Equipment Program)
Received: 2 May 2019
Accepted: 11 September 2019
First Online: 16 September 2019
Ethics approval and consent to participate
: Participants provided signed written consent. All procedures were approved by the Lifespan Institutional Review Board for Protection of Human Subjects (Federal Wide Assurance FWA00001230).
: Not applicable.
: The authors declare that they have no competing interests.