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Annals of Internal Medicine|November 1, 1994
Effect of natural oxygen enrichment at low altitude on oxygen-dependent patients with end-stage lung diseaseM R Kramer, C Springer, N Berkman, et al.Annals of Emergency Medicine|November 1, 1991
Comparison of physician judgment and decision aids for ordering chest radiographs for pneumonia in outpatientsC L Emerman, N Dawson, T Speroff, et al.Pageof 2