1. Division of Postgraduate Prosthodontics; Tufts University School of Dental Medicine; Boston MA USA
2. Department of Prosthodontics; School of Dentistry; National and Kapodistrian University of Athens; Athens Greece
3. Department of Dentistry; Chi Mei Medical Center; Tainan Taiwan
4. Department of Medical Research; Chi Mei Medical Center; Tainan Taiwan
5. Department of Restorative Dentistry; School of Dentistry and Oral Health; Griffith University; Gold Coast Qld Australia