Sitepu, F. Y., E. Depari, W. Aditama, R. Halim, A. Isworo, B. H. P. Lumbangaol, M. M. Fathan, F. A. Aritonang, E. Sihotang, D. P. . Napitupulu, and A. Nofri. “A Survey of the Knowledge of Surveillance Officers and Outbreak Investigation Team Toward COVID-19 in North Sumatera Province, Indonesia”. Open Access Macedonian Journal of Medical Sciences, vol. 8, no. T1, June 2020, pp. 55-60, doi:10.3889/oamjms.2020.4910.