BibTex format
@article{Sivan:2020:10.1136/bmj.m4938,
author = {Sivan, M and Taylor, S},
doi = {10.1136/bmj.m4938},
journal = {BMJ},
pages = {m4938--m4938},
title = {NICE guideline on long covid},
url = {http://dx.doi.org/10.1136/bmj.m4938},
year = {2020}
}