Affiliation: | a Centers for Disease Control and Prevention, National Center for Injury Prevention and Control (NCIPC), 4770 Buford Hwy, NE, MS F-63, Atlanta, GA 30341-3717, USA b Epidemic Intelligence Service, Centers for Disease Control and Prevention, 1600 Clifton Rd., Mailstop E-92, Atlanta, GA 30333, USA c Kansas Department of Health and Environment, Bureau of Health Promotion, 1000 SW Jackson St # 230, Topeka, KS 66612-1274, USA |