1. Biomedical Photonic Imaging, Faculty of Science and Technology, Mira Institute of Biomedical Technology and Technical Medicine, University of Twente, Postbox 217, 7500AE Enschede, The Netherlands
2. MiPlaza Materials Analysis, Philips Research Europe, High Tech Campus 11, 5656 AE Eindhoven, The Netherlands
3. Biomedical Engineering and Physics, Academic Medical Center, University of Amsterdam, P.O. Box 22700, 1100 DE Amsterdam, The Netherlands