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Hertenstein E, Tang NK, Bernstein CJ, Nissen C, Underwood MR, Sandhu HK.Hertenstein E, et al.Sleep Med Rev. 2016 Apr;26:95-107. doi: 10.1016/j.smrv.2015.04.004. Epub 2015 May 9.Sleep Med Rev. 2016.PMID: 26164369Review.