1. From the Sackler Faculty of Medicine (D.T., S.K., U.G., T.S., E.G., N.M.B.), Tel Aviv University, Tel Aviv, Israel; Chaim Sheba Medical Center (D.T., N.M., R.T.), Tel-Hashomer, Israel; the Center for Disease Control (T.S.), Ministry of Health, Tel-Hashomer, Israel; and Tel Aviv Sourasky Medical Center (N.M.B.) Tel Aviv, Israel.