Bosworth, M., Schofield, R., Ayoubkhani, D., Charlton, L., Nafilyan, V., Khunti, K., Zaccardi, F., Gillies, C., Akbari, A., Knight, M., Wood, R., Hardelid, P., Zuccolo, L. & Harrison, C. 2023, 'Vaccine effectiveness for prevention of covid-19 related hospital admission during pregnancy in England during the alpha and delta variant dominant periods of the SARS-CoV-2 pandemic: population based cohort study', BMJ Medicine, 2(1), article no: e000403. http://dx.doi.org/10.1136/bmjmed-2022-000403