Inverse association between toothbrushing and upper aerodigestive tract cancer risk in a Japanese population

Fumihito Sato, Isao Oze, Daisuke Kawakita, Noriyuki Yamamoto, Hidemi Ito, Satoyo Hosono, Takeshi Suzuki, Takakazu Kawase, Hiroki Furue, Miki Watanabe, Shunzo Hatooka, Yasushi Yatabe, Yasuhisa Hasegawa, Masayuki Shinoda, Minoru Ueda, Kazuo Tajima, Hideo Tanaka, Keitaro Matsuo