[1
]Department of Periodontology and Oral SurgeryFaculty of MedicineUniversity of Liège
Liege Belgium
[2
]Department of BiostatisticsUniversity HospitalUniversity of Liège Liege Belgium
[3
]Department of Public Health SciencesUniversity of Liège Liege Belgium
[4
]Dental Biomaterials Research UnitDepartment of Periodontology and Oral SurgeryFaculty
of MedicineUniversity of Liège Liege Belgium