1. Oral Technology, Dental School University Hospital Bonn Bonn Germany
2. Department of Orthodontics and Pediatric Dentistry, Hamdan Bin Mohammed College of Dental Medicine (HBMCDM) Mohammed Bin Rashid University of Medicine and Health Sciences (MBRU) Dubai United Arab Emirates
3. Institut Straumann AG Basel Switzerland
4. Department of Dental Health, College of Applied Medical Sciences King Saud University Riyadh Saudi Arabia
5. Department of Dental Prosthetics, Propaedeutics and Materials Science, Dental School University Hospital Bonn Bonn Germany