BibTex format
@article{Martin:2018:10.1136/bmj.k2381,
author = {Martin, G and Ghafur, S and Kinross, J and Hankin, C and Darzi, A},
doi = {10.1136/bmj.k2381},
journal = {BMJ: British Medical Journal},
title = {WannaCry-a year on},
url = {http://dx.doi.org/10.1136/bmj.k2381},
volume = {361},
year = {2018}
}