COVID-19

Withdrawn:

BMJ Publishing Group Ltd

10.1136/jim-2021-SRMC.113.445wit

April 1, 2021

Withdrawn:

BMJ Publishing Group Ltd

10.1136/jim-2021-SRMC.111.621wit

April 1, 2021

Withdrawn:

BMJ Publishing Group Ltd

10.1136/jim-2021-SRMC.112.643wit

April 1, 2021