A prospective observational safety study on ChAdOx1 nCoV-19 corona virus vaccine (recombinant) use in healthcare workers- first results from India. - Kaur U; Ojha B; Pathak BK; Singh A; Giri KR; Das A; Misra A; Yadav AK; Kansal S; Chakrabarti SS (EClinicalMedicine, 2021)