AUTHOR=Foged Camilla TITLE=Grand Challenges in Vaccine Delivery: Lessons Learned From the COVID-19 Vaccine Rollout JOURNAL=Frontiers in Drug Delivery VOLUME=2 YEAR=2022 URL=https://www.frontiersin.org/journals/drug-delivery/articles/10.3389/fddev.2022.964298 DOI=10.3389/fddev.2022.964298 ISSN=2674-0850