Kurosawa Hajime, Fujita Masahiro, Kobatake Satoshi, Kimura Hirokazu, Ohshima Mitsuko, Nagai Akira, Kaneko Shingaku, Iwasaki Yasuki, Kozawa Kunihisa
Gunma Prefectural Institute of Public Health and Environmental Sciences, Maebashi-shi, Gunma, Japan.
Jpn J Infect Dis. 2010 Jan;63(1):78-9.