Bin Hamedin, Mohamad Afiq Amsyar, et al. “EPIDEMIOLOGY OF COVID-19 AND RISK FACTORS OF COVID-19 INFECTIONS IN PULAU PINANG: A CASE CONTROL STUDY”. Malaysian Journal of Public Health Medicine, vol. 22, no. 2, Aug. 2022, pp. 156-64, doi:10.37268/mjphm/vol.22/no.2/art.879.