1. Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology Brigham & Women's Hospital & Harvard Medical School Boston Massachusetts USA
2. Sleep Medicine and Respiratory Function Unit Maugeri Clinical and Scientific Institutes IRCCS Pavia Italy
3. Respiratory Medicine and Sleep Laboratory, Department of Experimental and Clinical Sciences University of Brescia and Spedali Civili Brescia Italy
4. Department of General Medicine Mellini Hospital Italy
5. Department of Medical and Surgical Specialties, Radiological Sciences and Public Health University of Brescia Brescia Italy
6. Division of Pulmonary and Critical Care Medicine University of California San Diego La Jolla California USA
7. Department of Internal Medicine Spedali Civili Brescia Italy
8. Department of Allergy Immunology and Respiratory Medicine and Central Clinical School The Alfred and Monash University Melbourne Victoria Australia