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ACCCA (A Combined Clinical Concept Annotator) is a UIMA-based combination system for clinical record concept annotation. It can annotate clinical concepts with 3 concept types: problem, treatment, and test.


Currently ACCCA combines 6 systems (ABNER 1.5, Lingpipe 3.8, OpenNLP Chunker 2.1, JNET 2.3, Peregrine 2009, StanfordNER 1.1), and has been trained on the training corpus of the 2010 i2b2/VA clinical record concept annotation challenge. ACCCA combines the annotations of the different systems using a simple voting scheme to establish a combined annotation. We participated in the i2b2 clinical record concept annotation challenge, and ranked third out of 22 teams (F-score 82.2% for exact match, 90.6% for inexact match).

ACCCA is written in Java (1.6). It provides an online web service, supports a training mode, and allows users to easily add more systems in the combination framework. The system is open source and can be downloaded below.

Click here to go to ACCCA main page

Citing ACCCA: If you have used ACCCA in your study, please cite:

Ning Kang, Zubair Afzal, Bharat Singh, Erik M. van Mulligen, and Jan A. Kors. Using an ensemble system to improve concept extraction from clinical records. Journal of Biomedical Informatics, 2012

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