Imaging Classification of Constipation oleh Kei Ishimaru, Hiroshi Kakuto, Shungo Yukumi, Satoshi Akita, Yusuke Ogi, Satoshi Kikuchi, Motohira Yoshida, Shigejiro Koga, Hiroyuki Egi, Yuji Watanabe, Yoshito Ono, Hideo Watanabe