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FWR received funding from BICL as a shareholder and chief executive officer (CEO). SD received funding from Toshiba Medical Systems for consultation, and grants for a cone-beam computed tomographic clinical trial from GERRAF, and Carestream Health. The other authors declare that they did not have any competing interests. None of the authors had any competing interests that could influence the results of this work.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"No complex statistical methods were necessary for this paper.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Statistics and biometry"}},{"value":"Written informed consent was not required for this study because we used open-access OAI database. 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