1. Department of Environmental Engineering, Da-Yeh University, Changhua, Taiwan
2. Department of Radiology, Yonghe Cardinal Tien Hospital, New Taipei, Taiwan
3. Department of Medical Imaging and Radiological Technology, Yuanpei University of Medical Technology, Hsinchu, Taiwan
4. Department of Biomedical Engineering & Environmental Sciences, National Tsing-Hua University, Hsinchu, Taiwan