@article {1498855,
	title = {An end-to-end system to identify temporal relation in discharge summaries: 2012 i2b2 challenge},
	journal = {Journal of the American Medical Informatics Association},
	volume = {20},
	number = {5},
	year = {2013},
	pages = {849-858},
	url = {https://doi.org/10.1136/amiajnl-2012-001607},
	author = {Xu, Yan and Yining Wang and Tianren Liu and Junichi Tsujii and Eric I-Chao Chang}
}
