The use of NLP to identify Tdap related local reaction at five health care systems in the Vaccine Safety Datalink. - Chengyi Zheng; Wei Yu; Fagen Xie; Wansu Chen; Cheryl Mercado; Lina Sy; Lei Qian; Sungching Gleen; Hung Fu Tseng; Jonathan Duffy; Lisa A. Jackson; Matthew F. Daley; et al. (AMIA, 2017)