Praxis Westend, Berlin, Germany
Helsinki University Hospital, Helsinki, Finland
CHU de Caen, Caen Cedex, France
SleepMed of Central Georgia, Macon, Georgia, United States
Johns Hopkins University, Baltimore, Maryland, United States
Cetero Research, San Antonio, Texas, United States
Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States
Royal Brompton Hospital, London, Greater London, United Kingdom