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Fritscher-Ravens A, Soehendra N, Schirrow L, Sriram PV, Meyer A, Hauber HP, Pforte A.Fritscher-Ravens A, et al.Chest. 2000 Feb;117(2):339-45. doi: 10.1378/chest.117.2.339.Chest. 2000.PMID: 10669672
Fritscher-Ravens A, Sriram PV, Topalidis T, Hauber HP, Meyer A, Soehendra N, Pforte A.Fritscher-Ravens A, et al.Chest. 2000 Oct;118(4):928-35. doi: 10.1378/chest.118.4.928.Chest. 2000.PMID: 11035658