1. Department of Sanitary Engineering, Faculty of Public Health, Mahidol University, Ratchawithi Road, Ratchathewi, Bangkok 10400, Thailand
2. Center of Excellence on Environmental Health and Toxicology (EHT), Ratchawithi Road, Ratchathewi, Bangkok 10400, Thailand
3. National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Phahonyothin Road, Khlong Luang, Pathumthani 12120 Thailand