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Andong Natl Univ, Dept Educ Technol, B3122, 1375 Gyeongdong Ro, Andong Si 36729, Gyeongsangbuk D, South Korea
UCL, Inst Educ, 20 Bedford Way, London WC1H 0AL, England Andong Natl Univ, Dept Educ Technol, B3122, 1375 Gyeongdong Ro, Andong Si 36729, Gyeongsangbuk D, South Korea