BibTex format
@article{Mahamat-Saleh:2021:10.1136/bmjopen-2021-052777,
author = {Mahamat-Saleh, Y and Fiolet, T and Rebeaud, ME and Mulot, M and Guihur, A and El, Fatouhi D and Laouali, N and Peiffer-Smadja, N and Aune, D and Severi, G},
doi = {10.1136/bmjopen-2021-052777},
journal = {BMJ Open},
title = {Diabetes, hypertension, body mass index, smoking and COVID-19-related mortality: a systematic review and meta-analysis of observational studies},
url = {http://dx.doi.org/10.1136/bmjopen-2021-052777},
volume = {11},
year = {2021}
}