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Laugsand LE, Vatten LJ, Bjørngaard JH, Hveem K, Janszky I.Laugsand LE, et al. Among authors: bjorngaard jh.Psychosom Med. 2012 Jun;74(5):543-53. doi: 10.1097/PSY.0b013e31825904eb.Psychosom Med. 2012.PMID: 22685243
Laugsand LE, Strand LB, Vatten LJ, Janszky I, Bjørngaard JH.Laugsand LE, et al. Among authors: bjorngaard jh.Sleep. 2014 Nov 1;37(11):1777-86. doi: 10.5665/sleep.4170.Sleep. 2014.PMID: 25364073Free PMC article.