“Comparison Of Naso Faring And Oro Pharynx Swab Samples On Positivity Rate For Covid – 19 With The Reverse Transcription Method Pcr (Rt–Pcr) In The Lab. Rsud Pcr. City Padang Sidempuan”, JFM, vol. 6, no. 2, pp. 106–114, Apr. 2024, doi: 10.35451/jfm.v6i2.2021.