1. Department of Periodontology Institute of Odontology, The Sahlgrenska Academy University of Gothenburg Göteborg Sweden
2. Department of Periodontics University of Iowa, College of Dentistry and Dental Clinics Iowa City Iowa USA
3. School of Dentistry Espíritu Santo University Samborondon Ecuador
4. Department of Biomaterials, Institute of Clinical Sciences, The Sahlgrenska Academy University of Gothenburg Göteborg Sweden
5. Department of Oral Biochemistry, Institute of Odontology, The Sahlgrenska Academy University of Gothenburg Göteborg Sweden
6. Department of Periodontics and Oral Medicine University of Michigan School of Dentistry Ann Arbor Michigan USA
7. Laboratory of Epithelial Biology University of Michigan School of Dentistry Ann Arbor Michigan USA