1 Department of Diagnostic and Interventional Radiology, Fukuyama City Hospital, 5-23-1 Zao-cho, Fukuyama 721-8511, Japan; Department of Radiology, Okayama University Medical School, 2-5-1 Shikata-cho, Okayama 700-8558, Japan. Electronic address: iguchi@ba2.so-net.ne.jp.
2 Department of Diagnostic and Interventional Radiology, Fukuyama City Hospital, 5-23-1 Zao-cho, Fukuyama 721-8511, Japan. Electronic address: ebized@uoen.com.
3 Department of Internal Medicine, Fukuyama City Hospital, 5-23-1 Zao-cho, Fukuyama 721-8511, Japan. Electronic address: ma34tatsu111@gmail.com.
4 Department of Internal Medicine, Fukuyama City Hospital, 5-23-1 Zao-cho, Fukuyama 721-8511, Japan. Electronic address: azuki_yabushita2002@yahoo.co.jp.
5 Department of Internal Medicine, Fukuyama City Hospital, 5-23-1 Zao-cho, Fukuyama 721-8511, Japan. Electronic address: kosakaguchi@city.fukuyama.hiroshima.jp.
6 Department of Radiology, Okayama University Medical School, 2-5-1 Shikata-cho, Okayama 700-8558, Japan. Electronic address: susumu@cc.okayama-u.ac.jp.