We are grateful to the following people who have given peer review feedback on protocols and reviews in 2021:

A-D: Steve Arshinoff | John Buchan

E-H: Gus Gazzard | Andrzej Grzybowski

I-L: Sabeeh Kamil (c) | Anthony King | Ersilia Lucenteforte

M-P: Antonio Filipe Teixeira Macedo (Linnaeus University, Department of Medicine and Optometry) | Virginia Minogue (c) | Declan Murphy | Megan Prictor (c) 

Q-T: Vito Romano | Danial Sayyad | Roy Schwartz | David Steel

U-Z: 

(c) = consumer