. Author manuscript; available in PMC: 2014 Oct 1.
Published in final edited form as: J Biomed Inform. 2013 Jun 29;46(5):10.1016/j.jbi.2013.06.010. doi: 10.1016/j.jbi.2013.06.010
© 2013 The Authors, Published by Elsevier Inc. All rights reserved.