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Kohler M, Stoewhas AC, Ayers L, Senn O, Bloch KE, Russi EW, Stradling JR.Kohler M, et al.Am J Respir Crit Care Med. 2011 Nov 15;184(10):1192-9. doi: 10.1164/rccm.201106-0964OC.Am J Respir Crit Care Med. 2011.PMID: 21836134Clinical Trial.