1. From the Departments of Radiology (E.L.W., I.M.N., E.d.B., J.N.O., L.H., I.R., M.F.B.) and Pulmonology (S.W., J.W.K.v.d.B.), Isala Hospital, Dokter van Heesweg 2, 8025 AB Zwolle, the Netherlands; and Department of Radiology, University Medical Centre Utrecht, Utrecht, the Netherlands (P.A.d.J.).