BibTex format
@article{Jayatunga:2019:10.1136/bmjopen-2018-025965,
author = {Jayatunga, W and Stone, P and aldridge, R and Quint, J and george, J},
doi = {10.1136/bmjopen-2018-025965},
journal = {BMJ Open},
title = {Code sets for respiratory symptoms in electronic health records (EHR) research: a systematic review protocol},
url = {http://dx.doi.org/10.1136/bmjopen-2018-025965},
volume = {9},
year = {2019}
}