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机构:
Yonsei Univ, Coll Dent, Dept Prevent Dent & Publ Oral Hlth, PLUS Project BK 21, Seoul, South Korea
Univ Liverpool, Dept Hlth Serv Res, Liverpool, Merseyside, England
Inspektor Res Syst BV, Amsterdam, Netherlands Suwon Sci Coll, Dept Dent Hyg, Gyeonggi Do, South Korea