1. Department of Neurology, Osaka City General Hospital, Osaka, Japan
2. Sleep and Epilepsy Center, Neurocenter of the Southern Switzerland, Regional Hospital (EOC) of Lugano, Lugano, Switzerland
3. Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, Switzerland
4. Division of Sleep Medicine, Kansai Electric Power Medical Research Institute, Osaka, Japan
5. Multiple Sclerosis Center, Neurocenter of the Southern Switzerland, Regional Hospital (EOC) of Lugano, Lugano, Switzerland
6. Department of Neurology, University Hospital, Inselspital, Bern, Switzerland