1 Department of Anesthesiology, Chi Mei Medical Center, Tainan.
2 Department of Anesthesiology, Chi Mei Medical Center, Tainan; Department of Food Science and Applied Biotechnology, National Chung Hsing University, Taichung.
3 Department of Anesthesiology, Chi Mei Medical Center, Tainan; Department of the Senior Citizen Service Management, Chia Nan University of Pharmacy and Science, Tainan, Taiwan.