1. Department of Psychiatry, Himalayan Institute of Medical Sciences, Swami Ram Nagar, Jolly Grant, Dehradun, India
2. Sleep Clinic, Himalayan Institute of Medical Sciences, Swami Ram Nagar, Jolly Grant, Dehradun, India
3. Sleep Clinic, Capio Medical Center, Hamnplan, Örebro, Sweden
4. Department of Neurology, John Hopkins University, Baltimore, Maryland
5. Department of Neurology, Himalayan Institute of Medical Sciences, Swami Ram Nagar, Jolly Grant, Dehradun, India