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Journal of the American Medical Directors Association, ISSN 1525-8610, 2012, Volume 13, Issue 3, pp. 291 - 297
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Chest, ISSN 0012-3692, 2016, Volume 149, Issue 4, pp. 936 - 942
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PLoS ONE, ISSN 1932-6203, 02/2018, Volume 13, Issue 2, p. e0193143
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