Vaccine, Emergence, Termination, Sunspot Number as ON-OFF Switch for COVID-19 Pandemic with 25 Worst-Hit Countries. GJMR [Internet]. 2020 Oct. 1 [cited 2026 Aug. 13];20(K11):17-41. Available from: https://medicalresearchjournal.org/index.php/GJMR/article/view/2228