1. Division of Virology; Department of Microbiology and Immunology; Osaka University Graduate School of Medicine; Suita Osaka 565-0871 Japan
2. Laboratory of RNA Viruses; Department of Virus Research; Institute for Frontier Life and Medical Science (InFRONT); Kyoto University; Sakyo-ku Kyoto 606-8507 Japan
3. Department of Psychiatry; Osaka General Medical Center; Osaka Osaka 558-8558 Japan
4. Molecular Research Center for Children's Mental Development; United Graduate School of Child Development; Osaka University; Suita Osaka 565-0871 Japan