1. MIRA Institute for Biomedical Technology and Technical Medicine; Biomedical Photonic Imaging group; University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands
2. Thoraxcenter Twente; Medisch Spectrum Twente; P.O. Box 50.000 7500 KA Enschede The Netherlands
3. MIRA Institute for Biomedical Technology and Technical Medicine; Biomechanical Engineering group; University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands