1. Department of Operative, Preventive and Pediatric Dentistry Berlin Germany
2. Charité – Universitätsmedizin Berlin Corporate member of Freie Universität Berlin and Humboldt‐Universität zu Berlin Berlin Germany
3. Private Praxis Berlin Germany
4. Institute of Biometry and Clinical Epidemiology Berlin Germany
5. Department of Endodontology, Academic Center of Dentistry Amsterdam University of Amsterdam and VU University Amsterdam The Netherlands