A. M. Barreto Niño, P. A. Bonilla Reyes, J. F. Calderón Bonilla, M. A. Cantillo Avilez, J. A. Viña Lopera, and H. Quitian Reyes, “Associated Factors with Smoking Habit Beginning in University Students in Bogotá, Colombia”, Univ. Med., vol. 59, no. 2, Apr. 2018.