1. Respiratory Pathophysiology and Sleep Laboratory, Department of Medicine, M. Mellini Hospital, Chiari, Italy
2. Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham & Women's Hospital & Harvard Medical School, Boston, Massachusetts
3. Respiratory Medicine and Sleep Laboratory, Department of Internal Medicine, Spedali Civili di Brescia, University of Brescia, Brescia, Italy