1. From the International Epidemiology Institute (W.J.B.), Rockville, Md; Johns Hopkins University (M.A.I., R.B.), Baltimore, Md; the Cardiac Surgery Institute (T.D.I.), Cincinnati, Ohio; London, England (D.E.A.); Massachusetts General Hospital (A.W.), Boston, Mass; Saint Antonius Hospital (J.D.), Nieuwegein, the Netherlands; Trustees Bowling-Pfizer Settlement Funds (J.K.S.), Cincinnati, Ohio; and the University of Cincinnati (D.H.), Cincinnati, Ohio.