1. From the Departments of Radiology (M.N., E.J.I.), Rheumatology (E.I., J.A.), and Rehabilitation (N.R.), Hospital Sant Joan de Déu, Passeig Sant Joan de Déu 2, 08950 Esplugues de Llobregat, Barcelona, Spain; and Department of Oral and Maxillofacial Surgery, University Hospital of Torrejón, Madrid, Spain (G.Y.C.L.).