1 Faculty of Medical Technology, Mahidol University, Bangkok, Thailand ; Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa, Iowa City, IA 52242, USA.
2 Faculty of Science, Ramkhamhaeng University, Bangkok, Thailand.
3 Faculty of Medical Technology, Mahidol University, Bangkok, Thailand.
4 Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa, Iowa City, IA 52242, USA.