1. From the Department of General Surgery (M.A.R.C.D., V.H.H., C.v.V., T.G.A.M.W., W.A.B.), University of Maastricht, Maastricht, the Netherlands, and the Department of Molecular Biology (G.D., P.V.), Flanders Interuniversity Institute for Biotechnology and University of Ghent, Ghent, Belgium.