1. From the Center for Medical Imaging–North East Netherlands (W.J.H., R.V., M.O., K.P.d.J.), Department of Radiology (W.J.H., J.P.P., R.V.), and Department of Hepato-Pancreato-biliary Surgery (S.J.S.R., K.P.d.J.), University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, the Netherlands; and DEMCON Advanced Mechatronics, Enschede, the Netherlands (B.L.).