1. Department of Prosthodontics, Update Dental College & Hospital, Dhaka University, Dhaka-1711, Bangladesh
2. Department of Oral and Maxillofacial Surgery, VU University Medical Center, 1007 MB Amsterdam, The Netherlands
3. Maxillofacial Prosthetics Unit, Department of Prosthodontics, Faculty of Dentistry, Mahidol University, Bangkok 10400, Thailand