BibTex format
@article{Khan:2012:10.1136/gutjnl-2011-301748,
author = {Khan, SA and Davidson, BR and Goldin, RD and Heaton, N and Karani, J and Pereira, SP and Rosenberg, WMC and Tait, P and Taylor-Robinson, SD and Thillainayagam, AV and Thomas, HC and Wasan, H},
doi = {10.1136/gutjnl-2011-301748},
journal = {GUT},
pages = {1657--1669},
title = {Guidelines for the diagnosis and treatment of cholangiocarcinoma: an update},
url = {http://dx.doi.org/10.1136/gutjnl-2011-301748},
volume = {61},
year = {2012}
}