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APA Citation
Hopkinson, N. S., Rossi, N., El-Sayed_Moustafa, J., Laverty, A. A., Quint, J. K., Freidin, M., Visconti, A., Murray, B., Modat, M., Ourselin, S., Small, K., Davies, R., Wolf, J., Spector, T. D., Steves, C. J., & Falchi, M. (2021). current smoking and COVID-19 risk: results from a population symptom app in over 2.4 million people. Thorax, 76(7), 714–722. http://access.bl.uk/ark:/81055/vdc_100132726507.0x00001c