1. Technical University of Denmark, Department of Photonics Engineering, Roskilde, Denmark
2. University of Copenhagen, Cariology and Endodontics, Department of Odontology, Faculty of Health and Medical Science, Copenhagen N, Denmark
3. University of Copenhagen, Costerton Biofilm Center, Department of Immunology and Microbiology, Faculty of Health and Medical Science, Copenhagen N, DenmarkdRigshospitalet, Department of Clinical Microbiology, Copenhagen Ø, Denmark