Visiting President Scott W. Atlas, Hoover Institution, Stanford University, Stanford, US Scott W. Atlas, Hoover Institution, Stanford University, Stanford, USA Tarek Yousry, University College London, London, UK Iain Lyburn, Cobalt Imaging Center, Cheltenham, UK Berit Verbist, Leiden University Medical Center, Leiden, Netherlands Rik Achten, University Hospital Ghent, Belgium Tommy Andersson, AZ Groeninge, Kortrijk, Belgium Jan Casselman, Sint-Jan Hospital, Bruges, Belgium Laurens De Cocker, Hospital Sint-Jan, Brussels, Belgium Philippe Demaerel, University Hospital Leuven, Leuven, Belgium Paul Parizel, University Hospital Antwerp, Belgium