Sitepu, Frans Yosep, Elpiani Depari, Wiwit Aditama, Rd Halim, Adi Isworo, Bangun Hot Pandapotan Lumbangaol, Muhammad M Fathan, Firman Apul Aritonang, Elinsa Sihotang, Dormani Peronika Napitupulu, and Arwan 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 8, no. T1 (June 20, 2020): 55-60. Accessed October 30, 2020. https://www.id-press.eu/mjms/article/view/4910.