Letter to Editor
Authors
1 Chronic Respiratory Disease Research Center (CRDRC), National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
2 Iran Helal Institute of Applied-Science and Technology, Research Center For Health Management in Mass Gathering, Red Crescent Society of the Islamic Republic of Iran, Tehran, Iran
3 Tobacco Prevention and Control Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
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