RT Journal Article SR Electronic T1 The way forward after COVID-19 vaccination: vaccine passports with blockchain to protect personal privacy JF BMJ Innovations JO BMJ Innov FD All India Institute of Medical Sciences SP 337 OP 341 DO 10.1136/bmjinnov-2021-000661 VO 7 IS 2 A1 Tsoi, Kelvin K F A1 Sung, Joseph J Y A1 Lee, Helen W Y A1 Yiu, Karen K L A1 Fung, Hong A1 Wong, Samuel Y S YR 2021 UL http://innovations.bmj.com/content/7/2/337.abstract AB