Kiththiworaphongkich W. Disease course and temporal changes of chest X-ray findings in COVID-19 positive patients at Phayao hospital. J Nakornping Hosp [internet]. 2021 Jun. 27 [cited 2026 Sep. 29];12(1):149-67. available from: https://he01.tci-thaijo.org/index.php/jnkp/article/view/249949