[1
]Department of Periodontology, Institute of Odontology, Sahlgrenska Academy, University
of Gothenburg; Gothenburg Sweden
[2
]University of California San Francisco; San Francisco CA USA
[3
]State University of Maringa; Parana Brazil
[4
]University of Iowa; Iowa City IA USA
[5
]Universidad Santiago de Compostela; Santiago Spain
[6
]University of California Los Angeles; Los Angeles CA USA
[7
]University of Melbourne; Melbourne Australia
[8
]University of Texas Health Science Center; San Antonio TX USA
[9
]Universidad Complutense; Madrid Spain
[10
]Clinic of Fixed and Removable Prosthodontics and Dental Material Science, University
of Zurich; Zurich Switzerland
[11
]University of Sydney; Sydney Australia
[12
]Stony Brook University; Stony Brook NY USA
[13
]Seoul National University; Seoul South Korea
[14
]Department of Periodontology and Oral Surgery, University of Liège; Liège Belgium
[15
]School of Dentistry, University of Michigan; Ann Arbor MI USA
[16
]Leuven University; Flanders Belgium
[17
]Kristianstad University; Kristianstad Sweden
[18
]Department of Periodontology, University of Bern; Bern Switzerland
[19
]Department of Oral Surgery and Implantology, Carolinum, Goethe University; Frankfurt
Germany
[20
]Columbia University; New York NY USA
[21
]Department of Reconstructive Dentistry, University of Basel; Basel Switzerland