1. Section 1, Oral Medicine, Oral Pathology & Clinical Oral Physiology; Department of Odontology; Faculty of Health and Medical Sciences; University of Copenhagen; Copenhagen Denmark
2. Section of Oral Biochemistry, Cariology & Endodontics; Department of Odontology; Faculty of Health and Medical Sciences; University of Copenhagen; Copenhagen Denmark
3. Mucosal & Salivary Biology Division; King's College London Dental Institute; Guy's & St Thomas' Hospitals; London UK