1. Institute of Biomedical Optics, University of Lübeck, Peter-Monnik-Weg 4, Lübeck 23562, Germany
2. Medical Laser Center Lübeck, Peter-Monnik-Weg 4, Lübeck 23562, Germany
3. Por-Lab, Porphyrin-Laboratories GmbH, Blauenkrog 15, Scharbeutz 23684, Germany