1. Department of Artificial Organs; Akane-Foundation, Tsuchiya General Hospital; 3-30 Nakajimacho Naka-ku Hiroshima 730-8655 Japan
2. Department of Nephrology; Miyoshi Central Hospital; 531 Higashisakeya-cho Miyoshi Hiroshima 728-8502 Japan
3. Department of Nephrology; Hiroshima University; 1-2-3 Kasumi Minami-ku Hiroshima 734-8551 Japan
4. Faculty of Medicine; Hiroshima University; 1-2-3 Kasumi Minami-ku Hiroshima 734-8551 Japan