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<http://linkedlifedata.com/resource/pubmed/commentcorrection/19998869-9493521> <http://linkedlifedata.com/resource/pubmed/referenceSource> "J Sleep Res. 1997 Dec;6(4):221-9" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/19998869-9493521> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/9493521> .