1 Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada.
2 Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada; Leon Judah Blackmore Centre for Sleep Disorders, UBC Hospital, Vancouver, British Columbia, Canada.
3 Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada; Leon Judah Blackmore Centre for Sleep Disorders, UBC Hospital, Vancouver, British Columbia, Canada. Electronic address: [email protected].