1. Clinical Research Center for Allergy and Rheumatology; Sagamihara Hospital, National Hospital Organization; Kanagawa; 252-0392; Japan
2. Japanese Red Cross Kanto-Koshinetsu Block Blood Center; Tokyo; 135-8639; Japan
3. Molecular and Genetic Epidemiology Laboratory; Faculty of Medicine, University of Tsukuba; Tsukuba; 305-8575; Japan