Cite
APA Citation
Aveyard, P., Gao, M., Lindson, N., Hartmann-Boyce, J., Watkinson, P., Young, D., Coupland, C. A. C., Tan, P. S., Clift, A. K., Harrison, D., Gould, D. W., Pavord, I. D., & Hippisley-Cox, J. (2021). association between pre-existing respiratory disease and its treatment, and severe COVID-19: a population cohort study. Lancet, 9(8), 909–923. http://access.bl.uk/ark:/81055/vdc_100139602362.0x000003