Institution: | (1) Laser Center, Academic Medical Centre, Meibergdreef 9, 1105 Amsterdam, The Netherlands;(2) Birmingham Skin Centre, City Hospital NHS Trust, Dudley Road, Birmingham, B18 7QH, UK;(3) Department for Conservative Dentistry, Peridontology and Preventive Dentistry, University Hospital Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany |