1. From the Institute of Radiology (Q.D.S., V.M., R.S., S.M., C.S., O.W.H.) and Department of Nuclear Medicine (S.H., D.S., J.G., D.H.), University of Regensburg Medical Center, Franz-Josef-Strauss-Allee 11, 93053 Regensburg, Germany; and Departments of Pulmonology (S.B.) and Radiology (O.W.H.), Donaustauf Hospital, Donaustauf, Germany.