- Correspondence to Professor Poul Jennum, Danish Centre for Sleep Medicine, Department of Clinical Neurophysiology, Faculty of Health Sciences, University of Copenhagen, Glostrup Hospital, Glostrup DK 2600, Denmark;
- Received August 12, 2012
- Revised April 26, 2013
- Accepted May 11, 2013
- First published June 8, 2013.
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