- Elevated tissue plasminogen activator antigen and stroke risk: The Stroke Prevention In Young Women Study. Macko, R.F., Kittner, S.J., Epstein, A., Cox, D.K., Wozniak, M.A., Wityk, R.J., Stern, B.J., Sloan, M.A., Sherwin, R., Price, T.R., McCarter, R.J., Johnson, C.J., Earley, C.J., Buchholz, D.W., Stolley, P.D. Stroke (1999)