Ensembles of NLP Tools for Data Element Extraction from Clinical Notes. - Tsung-Ting Kuo; Pallavi Rao; Cleo K. Maehara; Son Doan; Juan D. Chaparro; Michele E. Day; Claudiu Farcas; Lucila Ohno-Machado; Chun-Nan Hsu (AMIA, 2016)