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https://t.co/NGB47YZRZ1 Oral toxicity of titanium dioxide P25 at repeated dose 28-day and 90-day in rats Min Beom Heo, Minjeong Kwak, Kyu Sup An, Hye Jin Kim, Hyeon Yeol Ryu, So Min Lee, Kyung Seuk Song, In Young Kim, Ji-Hwan Kwon and Tae Geol Lee Nanotech