Author affiliations: 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)
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