1. Department of Oral Health Sciences, Endodontology, KU Leuven & Dentistry University Hospitals Leuven Leuven Belgium
2. Center for Innovation and Research in Oral Sciences (CIROS) I Institute of Endodontic, Faculty of Medicine University of Coimbra Coimbra Portugal
3. Department of Stomatology, Section of Endodontics, School of Dentistry University of Seville Seville Spain