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Kazuo Machii, Kenji Owada, Shuichi Muroi, Kazuo Ono, Yasunori Tsukahara, Mikihiro Kijima, Yoshihiro Miyazaki, Naoyuki Awano, Toshiyuki Higuchi, Makoto Sato, Masatoshi Takezawa, Shigeo Kariyone. "Abnormal ECG detected by group heart examination in school children." Japanese Journal of Electrocardiology 2.3 (1982) 306-316