Classification of CT pulmonary angiography reports by presence, chronicity, and location of pulmonary embolism with natural language processing. - Yu, Sheng; Kumamaru, Kanako K.; George, Elizabeth; Dunne, Ruth M.; Bedayat, Arash; Neykov, Matey; Hunsaker, Andetta R.; Dill, Karin E.; Cai, Tianxi; Rybicki, Frank J. (J. Biomed. Informatics, 2014)