1. National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, Aoyama-cho, Kure, Hiroshima 737-0023, Japan
2. Research Center for Pharmaceutical Health Care and Sciences, Faculty of Pharmaceutical Sciences, Hiroshima International University, Hiro-Koshingai, Kure, Hiroshima 737-0112, Japan
3. Laboratory of Molecular Microbiological Science, Faculty of Pharmaceutical Sciences, Hiroshima International University, Hiro-Koshingai, Kure, Hiroshima 737-0112, Japan
4. Saiseikai Kure Hospital, Sanjo, Kure, Hiroshima 737-0821, Japan