DEEPEN: A negation detection system for clinical text incorporating dependency relation into NegEx.

Saeed Mehrabi Anand Krishnan Sunghwan Sohn Alexandra M. Roch Heidi Schmidt Joe Kesterson Chris Beesley Paul R. Dexter C. Max Schmidt Hongfang Liu Mathew J. Palakal

Published in: J. Biomed. Informatics (2015)