1. Clinical Research Center, National Hospital Organization Nagoya Medical Center , Nagoya, Aichi 460-0001, Japan
2. Department of AIDS Research, Division of Basic Medicine, Nagoya University Graduate School of Medicine , Nagoya, Aichi 466-8550, Japan
3. Department of Respiratory Medicine, Division of Internal Medicine, Nagoya University Graduate School of Medicine , Nagoya, Aichi 466-8550, Japan