489521 Sosial BudayaCFR, HIE, NNVT, Pfizer-BioNTech, relative risk reduction, uji coba vaksinVaksin Percobaan (*Bagian 2)
509521 Sosial BudayaBBC, BMGF, Oxford-AstraZeneca, Pfizer-BioNTech, vaksin percobaanVaksin Percobaan (*Bagian 1)