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Masamitsu Hyodo, Kahori Hirose, Asuka Nagao, Manatsu Yoshida, Koichi Omori, Osamu Shiromoto, Noriko Nishizawa, Yasuo Hisa, Eiji Yumoto. "Nationwide Survey of Spasmodic Dysphonia in Japan." The Japan Journal of Logopedics and Phoniatrics 57.1 (2016) 1-6