1. Department of Biomaterials, Institute of Clinical Sciences, Sahlgrenska Academy University of Gothenburg Göteborg Sweden
2. Department of Dentistry, School of Health and Life Sciences Pontifical Catholic University of Rio Grande do Sul (PUCRS) Porto Alegre Brazil
3. Department of Periodontics University of Iowa College of Dentistry Iowa City Iowa USA
4. Research Center, School of Dentistry Espiritu Santo University Samborondón Ecuador
5. Institute of Odontology, Sahlgrenska Academy University of Gothenburg Göteborg Sweden
6. Department of Oral Biochemistry, Institute of Odontology, Sahlgrenska Academy University of Gothenburg Göteborg Sweden