BibTex format
@article{Altmann:2021:10.1136/bmj.n132,
author = {Altmann, DM and Boyton, RJ},
doi = {10.1136/bmj.n132},
journal = {BMJ: British Medical Journal},
pages = {1--2},
title = {Decoding the unknowns in long covid},
url = {http://dx.doi.org/10.1136/bmj.n132},
volume = {372},
year = {2021}
}