1. Center of General Education, Southern Taiwan University of Science and Technology, Tainan 710, Taiwan, R.O.C.
2. Department of Emergency Medicine, Cheng Hsin General Hospital, Taipei 112, Taiwan, R.O.C.
3. Department of Medical Research and Education, Cheng Hsin General Hospital, Taipei 112, Taiwan, R.O.C.
4. Department of Physiology and Biophysics, Graduate Institute of Physiology, National Defense Medical Center, Taipei 114, Taiwan, R.O.C.