1. Medical Corporation Matsui Internal Clinic, Iwate, Japan
2. Iwate Prefecture Research Center for Environmental Health, Iwate, Japan
3. Iwate Prefecture Ninohe Health Center, Iwate, Japan
4. Department of Bacteriology I, National Institute of Infectious Diseases, Tokyo, Japan
5. Division of Pulmonary Medicine, Allergy and Rheumatology, Department of Internal Medicine, Iwate Medical University School of Medicine, 19-1 Uchimaru, Morioka 020-8505, Japan