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Ko KH, Kang HG, Huh YH, Park CJ, Cho LR.  Concept and application of implant connection systems: Part II. Placement and restoration of external connection implant and tissue level implant.  J Dent Rehabil Appl Sci 2020;36:222-231.  https://doi.org/10.14368/jdras.2020.36.4.222