1. From the Departments of Interventional Neuroradiology (A.H.S., C.P.G., C.T., A.L.F., S.R., M.M.) and Radiology (J.A.), Hospital Clínico San Carlos, Calle del Profesor Martín Lagos s/n, 28040 Madrid, Spain; and Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand (T.J.).