BibTex format
@article{Hopkinson:2021:10.1136/thoraxjnl-2020-216422,
author = {Hopkinson, N and Rossi, N and El-Sayed, Moustafa JS and Laverty, A and Quint, J and Freidin, MB and Visconti, A and Murray, B and Modat, M and Ourselin, S and Small, K and Davies, R and Wolf, J and Spector, TD and Steves, CJ and Falchi, M},
doi = {10.1136/thoraxjnl-2020-216422},
journal = {Thorax},
pages = {714--722},
title = {Current smoking and COVID-19 risk: results from a population symptom app in over 2.4 million people},
url = {http://dx.doi.org/10.1136/thoraxjnl-2020-216422},
volume = {76},
year = {2021}
}