Abo-Elkheir, O. I., and M. R. Hafez. “Characteristics, Risk Factors and Histopathological Types of Bronchogenic Carcinoma Among Cases Presented to Chest Department, Al-Zahraa Hospital, Al-Azhar University”. International Journal Of Community Medicine And Public Health, vol. 5, no. 4, Mar. 2018, pp. 1281-90, doi:10.18203/2394-6040.ijcmph20181203.