A Twitter Study of the Relationship between the Geographic Variations of HPV Vaccination Rates and Online Information in the United States. - Hansi Zhang; Yunpeng Zhao; Christopher Wheldon; Xinsong Du; Terrell Brown; Yi Guo 005; Stephanie Staras; Jingcheng Du; Cui Tao; Jiang Bian 001 (AMIA, 2017)