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[1]
Hospital Epidemiology and Infectology Unit, National Institute of Respiratory Diseases Ismael Cosío Villegas, Tlalpan, Mexico
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[2]
Department of Research in Tobacco and COPD, National Institute of Respiratory Diseases Ismael Cosío Villegas, Tlalpan, Mexico
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[3]
Department of Health Economics, National Institute of Respiratory Diseases Ismael Cosío Villegas, Tlalpan, Mexico
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[4]
Clinical Research Subdirectorate, National Institute of Respiratory Diseases Ismael Cosío Villegas, Tlalpan, Mexico