Document Type : Letter to Editor
Authors
1 Chronic Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
2 Tracheal Diseases Research Center, NRITLD, Shahid Beheshti University of Medical Sciences, Tehran, Iran
3 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
4 Department of Anesthesiology and Critical Care Medicine, School of Medicine, Masih Daneshvari Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.