1. Department of Immunology and Parasitology, School of Medicine; University of Occupational and Environmental Health, Japan; Kitakyushu-shi Fukuoka 807-8555 Japan
2. Department of Clinical Laboratory; the Fourth Hospital of Hebei Medical University; Shijiazhuang 050035 China
3. Department of Health Sciences; Oita University of Nursing and Health Sciences; Notsuharu Oita 870-1201 Japan