Gamakaranage, C. S. K., Hettiarachchi, D., Ediriweera, D., & Jayasinghe, S. (2021). Symptomatology of COVID-19 - Lessons from a meta-analysis across 13 countries. Asian Journal of Medical Sciences, 12(11), 3–15. https://doi.org/10.3126/ajms.v12i11.39321