1. From the Departments of Preventive Medicine (M.B.C., D.M.S., C.N.F., A.Y.W., G.S.K., F.S.A., N.D.S.), Emergency Medicine (S.J.G., E.S.P.), Family and Community Medicine (A.Y.W.), and Medicine (F.S.A., R.K.M.), Feinberg School of Medicine, Northwestern University, Chicago, IL.