Kerdsuk, N., C. Jitpanya, and N. Ua-kit. “A Factor Analysis of Long Covid Symptom Clusters in Thais People After Coronavirus 2019 Infection, Bangkok Metropolitan”. HCU Journal, vol. 27, no. 2, Dec. 2023, pp. 157-69, https://he01.tci-thaijo.org/index.php/HCUJOURNAL/article/view/259905.