1. a Prosthetic Dentistry, Faculty of Odontology, Malmö University , Malmö , SE-205 06 , Sweden
2. b Biomedical Laboratory Science and Technology, Faculty of Health and Society, Malmö University , Malmö , SE-205 06 , Sweden
3. c Promimic AB, Stena Center 1b , SE-412 92 , Göteborg , Sweden