1. Biomedical Photonic Imaging Group, MIRA Institute for Biomedical Technology and Technical Medicine, Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
2. Center for Optical Diagnostics and Therapy, Department of Radiation Oncology, Erasmus Medical Center, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands
3. Academic Medical Center, Biomedical Engineering and Physics, University of Amsterdam, P.O. Box 22700, NL-1100 DE Amsterdam, The Netherlands