1. Department of Restorative Dentistry; Araraquara Dental School; São Paulo State University (UNESP); Araraquara SP Brazil
2. Department of Endodontology; Academic Center for Dentistry Amsterdam; University of Amsterdam; Amsterdam The Netherlands
3. Department of Statistics and Operations Research; Faculty of Science; University of Malta; Msida Malta
4. Department of Restorative Dentistry; Faculty of Dental Surgery; University of Malta; Msida Malta