Correction to: Relationship between Air Pollution and Mortality Rate due to Chronic Obstructive Pulmonary Diseases in Mashhad, Iran

Correction to: Relationship between Air Pollution and Mortality Rate due to Chronic Obstructive Pulmonary Diseases in Mashhad, Iran Narges Ghorbani1,Jamshid YazdaniCharati2, Siavash Etemadinejad3,Nasrin Ghorbani4 1 PhD Student in Biostatistics, Student Research Committee, Hamadan University of Medical Sciences, Hamadan, Iran2 Associate Professor, Department of Biostatistics, Health Sciences Research Center, Addiction Institute, Mazandaran University of Medical Sciences, Sari, Iran3 Associate Professor, Department of Occupational Health and Ergonomics, Health Sciences Research Center , Mazandaran University of Medical Sciences, Sari, Iran4 Medical Records Technician, Omid Hospital, Mashhad, Iran In the article published in volume 28, issue 169, 2018, the affiliation for the corresponding author was published incorrectly, which is now corrected.