Chen J, Noni Novisari Soeroso, Syamsul Bihar, Lambok Siahaan. Correlation Between Carbon Monoxide Level In Exhaled Air and Pulmonary Function On Grill Street-Vendors In Medan City. JETROMI [Internet]. 2021 Aug. 30 [cited 2026 Sep. 22];3(3):85-90. Available from: https://talenta.usu.ac.id/jetromi/article/view/6382