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Koichi Yabunaka, Gojiro Nakagami, Keiko Tabata, Junko Sugama, Masaru Matsumoto, Yoshifumi Kido, Terumi Iuchi, Hiromi Sanada. "Constipation in the elderly in a Japanese long-term medical facility: An ultrasonographic investigation." Drug Discoveries & Therapeutics 12.4 (2018) 233-238