1. Recurrent pneumonia;Abrutyn,1984
2. The diabetic as a compromised host;Allen,1981
3. Significance of unresolved organizing or protracted pneumonia;Ambersen;J Mich State Med Soc,1943
4. The clinical picture of primary non-specific pneumonia;Arisi;Schweiz Med Wochenschr,1962
5. Association between cigarette smoking and acute respiratory tract illness in young adults;Aronson;JAMA,1982