1. Department of Anesthesia, Chi Mei Medical Center, Chiali, Tainan 71004, Taiwan, R.O.C.
2. Department of Anatomy, School of Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, R.O.C.
3. Department of Cell Biology and Anatomy, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan, R.O.C.
4. Department of Anesthesia, An Nan Hospital, China Medical University, Tainan 70965, Taiwan, R.O.C.