1. Department of Oral Microbiology and Immunology; Institute of Odontology; Sahlgrenska Academy; Gothenburg University; Gothenburg Sweden
2. Beijing Hospital; Beijing China
3. Section of Oral and Diagnostic Sciences; Division of Periodontics; College of Dental Medicine; Columbia University; New York NY USA
4. Department of Dentistry, Health; Aarhus University; Aarhus Denmark
5. Department of Biomedicine, Health; Aarhus University; Aarhus Denmark