1. Statistical Handbook of Japan (2012) Statistical Research and Training Institute, (Eds). Published by the Statistics Bureau, Ministry of Internal Affairs and Communications [Internet] (Cited 2013 Aug 19). Available from: http://www.stat.go.jp/data/nihon/back12/index.htm .
2. Hotaling DL. Nutritional considerations for the pureed diet texture in dysphagic elderly. Dysphagia. 1992;7:81–5.
3. Ministry of Health, Labour and Welfare of Japan (2009) “Testing Method for Foods for People with Difficulty in Swallowing” specified in “Approval of Indication of Foods for Special Dietary Use.” (Notification No. 0212001, 20, Department of Food Safety, Pharmaceutical and Food Safety Bureau, Feb. 12, 2009).
4. Fujisaki T. Universal Design Foods. J Jpn Soc Food Sci Technol. 2008;55(2):78–9 (in Japanese).
5. Sakai M, Egashira F, Kanaya S, Kayashita J. Comparison of food physical properties with reference to clinically effective stepwise swallowing foods. J Jpn Soc Dysphagia Rehabil. 2006;10(3):239–48 (in Japanese).