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 Yazdani-Charati2,  Siavash Etemadinejad3, Nasrin Ghorbani4   1 PhD Student in Biostatistics, Student Research Committee, Hamadan University of Medical Sciences, Hamadan, Iran 2 Associate Professor, Department of Biostatistics, Health Sciences Research Center, Addiction Institute, Mazandaran University of Medical Sciences, Sari, Iran 3 Associate Professor, Department of Occupational Health and Ergonomics, Health Sciences Research Center , Mazandaran University of Medical Sciences, Sari, Iran 4 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.