1. Department of Virology, Toyama Medical and Pharmaceutical University, 2630 Sugitani, Toyama 930-0194, Japan
2. Faculty of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University, 2630 Sugitani, Toyama 930-0194, Japan
3. Kunming Institute of Botany, Academia Sinica, Kunming, Yunnan, China
4. Faculty of Integrated Arts and Sciences, University of Tokushima, Tokushima 770-0814, Japan