PLoS One
http://www.plosone.org/
[Accessed 15 Jan 2022]

A systematic review of methodological approaches for evaluating real-world effectiveness of COVID-19 vaccines: Advising resource-constrained settings
Yot Teerawattananon, Thunyarat Anothaisintawee, Chatkamol Pheerapanyawaranun, Siobhan Botwright, Katika Akksilp, Natchalaikorn Sirichumroonwit, Nuttakarn Budtarad, Wanrudee Isaranuwatchai
Research Article | published 11 Jan 2022 PLOS ONE
https://doi.org/10.1371/journal.pone.0261930