1 Division of Cardiology, Department of Internal Medicine, Chi-Mei Medical Center, Liouying, Tainan 736, Taiwan. b891040733@yahoo.com.tw.
2 School of Mechanical & Electronic Engineering, Sanming University, Sanming City 365004, China. a0939640405@gmail.com.
3 Department of Occupational Medicine, Tainan Municipal Hospital (Managed by Show Chwan Medical Care Corporation), Tainan 701, Taiwan. ktchen@mail.ncku.edu.tw.
4 Department of Public Health, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan. ktchen@mail.ncku.edu.tw.