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Lewis M, Kallenbach J, Ruff P, Zaltzman M, Abramowitz J, Zwi S.Lewis M, et al.Chest. 1985 May;87(5):691-3. doi: 10.1378/chest.87.5.691.Chest. 1985.PMID: 3872776
Lewis M, Kallenbach J, Zaltzman M, Hurwitz M, Shapiro T, Zwi S.Lewis M, et al.Chest. 1983 Dec;84(6):733-4. doi: 10.1378/chest.84.6.733.Chest. 1983.PMID: 6641309No abstract available.
Zwi S, Davies JC, Becklake MR, Goldman HI, Reinach SG, Kallenbach JM.Zwi S, et al. Among authors: kallenbach jm.S Afr Med J. 1990 Dec 1;78(11):647-53.S Afr Med J. 1990.PMID: 2251608