A UMLS-based spell checker for natural language processing in vaccine safety. - Tolentino, Herman D.; Matters, Michael D.; Walop, Wikke; Law, Barbara; Tong, Wesley; Liu, Fang; Fontelo, Paul A.; Kohl, Katrin; Payne, Daniel C. (BMC Medical Informatics Decis. Mak., 2007)

Concept Negation in Free Text Components of Vaccine Safety Reports. - Tolentino, Herman D.; Matters, Michael D.; Walop, Wikke; Law, Barbara; Tong, Wesley; Liu, Fang; Fontelo, Paul A.; Kohl, Katrin; Payne, Daniel C. (2006)