Affiliation: | National Defense Medical College, Saitama, Japan (K. Imai, T. Maeda, K. Mikita, Y. Fujikura, K. Misawa, M. Nagumo, T. Ono, Y. Miyahira, A. Kawana); ;Japanese Red Cross Society, Tokyo, Japan (Y. Sayama, S. Miura);; Tokai University Oiso Hospital, Kanagawa, Japan (O. Iwata); ;National Institute of Infectious Diseases, Tokyo (I. Kurane) |