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Author Ralf Schulze is non-honorarium-based member of several committees of the German Institut of Standardization (DIN) and also of a national technical committee on radiation protection (Arbeitskreis R\u00f6ntenverordnung, AKR\u00f6V). He is also representative for dental radiology and radiation protection for the World Dental Federation (FDI).","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"As retrospective study using radiographs from an existing database without publication of any patient-related information, no ethical approval is required in our University Medical Center.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"Since all the data (radiographic images) used for the study were taken from the existing database and were used in an anonymized fashion, no extra informed consent was required for this type of study. In our center, patients give a general consent that their data in anonymized fashion may be used for scientific study purposes, if their personal data rights and medical confidentiality is adhered.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Informed consent"}}]}}