Burney, P., Perez-Padilla, R., Marks, G., Wong, G., Bateman, E., et. al. .“Chronic Lower Respiratory Tract Diseases”. In: Disease Control Priorities (third edition): Volume 5, Cardiovascular, Respiratory, and Related Disorders, edited by D. Prabhakaran, S. Anand, T. Gaziano, J. Mbanya, Y. Wu, R. Nugent. Washington, DC: World Bank.