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Niwa Koki Tham khảoLiên quan
Niwa Ryuhei Niwa Uichirō Niwatthamrong Boonsongpaisan Niwa Koki Niwa Nagahide Niwa Shion Niwa, Aichi Niwata Akiko Niwai Niwa DaikiTài liệu tham khảo
WikiPedia: Niwa Koki http://www.old.ittf.com/ittf_ranking/WR_Table_3_A2... http://www.incheon2014ag.org/Sports/Biographies/At... https://www.tomamin.co.jp/news/main/11941/ https://web.archive.org/web/20141002022715/http://... https://web.archive.org/web/20170928084355/http://...