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Preston IR, Klinger JR, Landzberg MJ, Houtchens J, Nelson D, Hill NS.Preston IR, et al. Among authors: klinger jr.Chest. 2001 Sep;120(3):866-72. doi: 10.1378/chest.120.3.866.Chest. 2001.PMID: 11555522
Preston IR, Klinger JR, Houtchens J, Nelson D, Mehta S, Hill NS.Preston IR, et al. Among authors: klinger jr.Chest. 2002 Feb;121(2):656-9. doi: 10.1378/chest.121.2.656.Chest. 2002.PMID: 11834688
Preston IR, Klinger JR, Houtches J, Nelson D, Farber HW, Hill NS.Preston IR, et al. Among authors: klinger jr.Respir Med. 2005 Dec;99(12):1501-10. doi: 10.1016/j.rmed.2005.03.026.Respir Med. 2005.PMID: 15890512Free article.Clinical Trial.