BibTex format
@article{Guha:2013,
author = {Guha, S and Bourne, T and Ayim, F and Sayasneh, A and Stalder, C and Bottomley, C and Timmerman, D and Van, Calster B},
journal = {BJOG-AN INTERNATIONAL JOURNAL OF OBSTETRICS AND GYNAECOLOGY},
pages = {516--516},
title = {External validation of progesterone-based single visit protocol for management of pregnancy of unknown location compared to the βHCG based M4 prediction model},
url = {https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000320781601539&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb},
volume = {120},
year = {2013}
}