SARAEI, MARYAM, RAMIN MEHRDAD, EHSAN HEYDARBEYGI, and GHOLAMREZA POURYAGHOUB. 2018. “Quality of Spirometry Tests in Periodic Examination of Workers”. International Journal of Occupational Hygiene 10 (2). http://ijoh.tums.ac.ir/index.php/ijoh/article/view/329.