| المصدر: |
Krause , P R , Fleming , T R , Peto , R , Longini , I M , Figueroa , J P , Sterne , J A C , Cravioto , A , Rees , H , Higgins , J P T , Boutron , I , Pan , H , Gruber , M F , Arora , N , Kazi , F , Gaspar , R , Swaminathan , S , Ryan , M J & Henao-Restrepo , A-M 2021 , ' Considerations in boosting COVID-19 vaccine immune responses ' , Lancet , vol. 398 , no. .... |