[4] GUO X L,LI G,CHENG Y,et al. Standards and guidelines of radiation protection and safety in dental X-ray examinations[J]. Chinese Journal of Stomatology, 2017,52(12):762-772.
[4] GUO X L,LI G,CHENG Y,et al. Standards and guidelines of radiation protection and safety in dental X-ray examinations[J]. Chinese Journal of Stomatology, 2017,52(12):762-772.
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