1. Department of Health and Environmental Sciences, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan
2. Miyagi University of Education, Sendai 980-0845, Japan
3. Department of Science and Technology, Hanoi Medical University, Hanoi, Vietnam
4. Research Division of Atmospheric and Hydrospheric Disasters, Disaster Prevention Research Institute, Kyoto University, Uji 611-0011, Japan
5. Institute of Atmospheric Physics, Chinese Academy of Science, Beijing 100029, China