Sakon Naomi, Yamazaki Kenji, Yoda Tomoko, Tsukamoto Teizo, Kase Tetsuo, Taniguchi Koki, Takahashi Kazuo, Otake Toru
Department of Infectious Diseases, Osaka Prefectural Institute of Public Health, Higashinari-ku, Osaka 537-0025, Japan.
Jpn J Infect Dis. 2007 Nov;60(6):409-10.