1. Janssen Vaccines and Prevention, Leiden, the Netherlands (N.C.S., F.C., L.V., M.N.H., R.C.Z., J.H., C.P.C., M.L., M.D., J.V., H.S.)
2. Beth Israel Deaconess Medical Center, Boston, Massachusetts (K.E.S., D.G.K., R.A.L., P.A., J.L., L.P., D.H.B.)
3. Janssen Research and Development, Spring House, Pennsylvania (K.W.)
4. Janssen Research and Development, Beerse, Belgium (D.H., C.T.)
5. Johnson County Clin-Trials, Lenexa, Kansas (C.F.)
6. Walter Reed Army Institute of Research, Silver Spring, Maryland (R.A.D., K.M.).