Setiawan, J. et al. 2022. Analysis of the relationship between using personal protective equipment (PPE) masks on the incidence of respiratory symptoms disorders of online motorcycle taxis drivers in Malang. Qanun Medika - Medical Journal Faculty of Medicine Muhammadiyah Surabaya. 6, 1 (Jan. 2022). DOI:https://doi.org/10.30651/jqm.v6i1.10267.