[1
]
Department of Oral Function and Prosthetic Dentistry, Radboud University Medical Centre,
Nijmegen, The Netherlands.
[2
]
Periodontal Research Group, College of Medical and Dental Sciences, Dental School,
University of Birmingham, Birmingham, UK.
[3
]
Department of Special Care Dentistry, Birmingham Dental Hospital and School of Dentistry,
Birmingham, UK.
[4
]
Department of Restorative Dentistry, Birmingham Dental Hospital and School of Dentistry,
Birmingham, UK.