BibTex format
@unpublished{Alturkistani:2020:10.2196/preprints.18976,
author = {Alturkistani, A and Qavi, A and Anyanwu, PE and Greenfield, G and Greaves, F and Costelloe, C},
doi = {10.2196/preprints.18976},
publisher = {JMIR Publications},
title = {Patient portal functionalities and patient outcomes among patients with diabetes: systematic review (Preprint)},
url = {http://dx.doi.org/10.2196/preprints.18976},
year = {2020}
}