1 Guidelines Committee for Creating and Evaluating the "Evidence-Based Clinical Practice Guidelines for Irritable Bowel Syndrome", The Japanese Society of Gastroenterology, 6F Shimbashi I-MARK Building, 2-6-2 Shimbashi, Minato-Ku, Tokyo, 105-0004, Japan. sfukudo@med.tohoku.ac.jp.
2 Department of Behavioral Medicine, Tohoku University Graduate School of Medicine, 2-1 Seiryo-Machi, Aoba-Ku, Sendai, 980-8575, Japan. sfukudo@med.tohoku.ac.jp.
3 Guidelines Committee for Creating and Evaluating the "Evidence-Based Clinical Practice Guidelines for Irritable Bowel Syndrome", The Japanese Society of Gastroenterology, 6F Shimbashi I-MARK Building, 2-6-2 Shimbashi, Minato-Ku, Tokyo, 105-0004, Japan.