1. Department of Preventive Dentistry, Faculty of Dentistry, Jordan University of Science and Technology, Irbid, Jordan
2. Department of Removable Partial Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
3. Department of Removable Prosthodontics, Faculty of Dentistry, University of Jordan, Amman, Jordan
4. Oral Implantology and Regenerative Dental Medicine, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan