Loading Spyros Papageorgiou Clinic of Orthodontics and Pediatric Dentistry Center of Dental Medicine, University of Zurich, Zurich, Switzerland Salah Abbas The Dental School of Copenhagen, Denmark Stella Chaushu Hebrew University-Hadassah School of Dental Medicine, Jerusalem, Israel Axel Bergman University of Oslo, Norway Chooryung Judi Chung Gangnam Severance Hospital, Yonsei University College of Dentistry, Seoul, South Korea Martyn Cobourne King's College London, UK Marie A. Cornelis Melbourne Dental School, University of Melbourne, Australia Espen Færøvig University of Oslo, Norway Vinod Krishnan Sri Sankara Dental College, Kerala, India Cesare Luzi University of Ferrara and University of Rome Cattolica, Italy Julia Naoumova Institute of Odontology at Sahlgrenska Academy, University of Gothenburg, Sweden Maria Orellana Universit' Libre de Bruxelles (ULB), Belgium Mariano Sanz University Complutense of Madrid, Spain and University of Oslo, Norway Guy Willems University Hospitals Leuven and Ortholeuven, Belgium