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http://homepage3.nifty.com/tomorine3908/sun-tower/007.kyodosankaku.htm
http://wwwsoc.nii.ac.jp/jawe2/publish/welearn2003/data/0308_610report.pdf
http://subsite.icu.ac.jp/cgs/article/0408009j.html
http://www.medical-tribune.co.jp/ss/2005-9/ss0509-2.htm
http://blog.goo.ne.jp/midorinet002/e/87c50e81d8a936ecafcf4a2aa7ed4848
http://www.medical-tribune.co.jp/ss/2006-7/ss0607-2.htm