Woramalee, S., U. Klinkhajon, and A. Yuanjai. “Patients Infected with Coronavirus Disease 2019 in Negative pressure rooms: Case Study”. Siriraj Medical Bulletin, vol. 13, no. 4, Oct. 2020, pp. 261-7, https://he02.tci-thaijo.org/index.php/simedbull/article/view/241243.