BibTex format
@article{Guha:2014:humrep/deu045,
author = {Guha, S and Ayim, F and Ludlow, J and Sayasneh, A and Condous, G and Kirk, E and Stalder, C and Timmerman, D and Bourne, T and Van, Calster B},
doi = {humrep/deu045},
journal = {HUMAN REPRODUCTION},
pages = {938--945},
title = {Triaging pregnancies of unknown location: the performance of protocols based on single serum progesterone or repeated serum hCG levels},
url = {http://dx.doi.org/10.1093/humrep/deu045},
volume = {29},
year = {2014}
}