1. Faculty of Environmental Engineering, The University of Kitakyushu, Kitakyushu, Japan
2. Faculty of Environment, Da Nang University of Science and Technology, Da Nang, Vietnam
3. Department of Environmental Science, College of Sciences, Hue University, Hue, Vietnam
4. Faculty of Environmental Technology, VNU, Hanoi University of Science, Hanoi, Vietnam
5. Graduate School of Global Environment Studies, Kyoto University, Kyoto, Japan