Affiliation: | aDepartment of Radiology C-2S, Leiden University Medical Centre, Albinusdreef 2, NL-2333 ZA Leiden, The Netherlands bUniversité Paris-Sud XI, AP-HP, Service de Radiologie, Hôpital Paul Brousse, 12-14 Avenue Paul Vaillant Couturier, F-94804 Villejuif Cedex, France |