1. Department of Prosthetic Dentistry; Faculty of Medicine; Center for Dental Medicine; Medical Center - University of Freiburg; Freiburg Germany
2. Department of Prosthodontics; Geriatric Dentistry and Craniomandibular Disorders; Campus Benjamin Franklin (CBF); CC 3 Dental and Craniofacial Sciences; Charité - Universitätsmedizin Berlin; Berlin Germany
3. Institute of Medical Biometry and Statistics; Faculty of Medicine; Medical Center - University of Freiburg; Freiburg Germany