Kato S, Ono Y, Takagi T, Yoshida J, Hirakawa M, Ito T, Nakanishi K, Ogino J, Hasegawa T. [Case report; a case of ileus due to ileal stenosis caused by oral intake of calcium polystyrene sulfonate]. Nihon Naika Gakkai zasshi. The Journal of the Japanese Society of Internal Medicine. 2013. 102. 150-152