1. Division of Mechatronics Biostatistics and Sensors, Department of Biosystems, Katholieke Universiteit Leuven, Kasteelpark Arenberg 30, B-3001 Heverlee, Belgium, Centre for Biospectroscopy and Data Modelling−Matforsk, Oslovegen 1, 1430 Ås, Norway, and Department of Mathematics, University of Oslo, Blindern, Norway