Varmaghani M, Farzadfar F, Sharifi F, Rashidian A, Moin M, Moradi-Lakeh M, Rahimzadeh S, saeedi Moghaddam S, Kebriaeezadeh A. Prevalence of Asthma, COPD, and Chronic Bronchitis in Iran: A Systematic Review and Meta-analysis. Iran J Allergy Asthma Immunol. 2016;15(2):93-104.