1. Department of Anaesthesiology, 806 General Hospital at Kaohsiung, Taiwan, R.O.C.,
2. Department of Anaesthesiology, Chang Gung Memorial Hospital, College of Medicine of Chang Gung University at Kweishan, Taoyuan, Taiwan, R.O.C.,
3. Department of Anaesthesiology, Chang Gung Memorial Hospital at Kaohsiung, Taiwan, R.O.C.,
4. Department of Anaesthesiology, 804 General Hospital at Taoyuan, Taiwan, R.O.C.,
5. Department of Anaesthesiology, National Cheng Kung University, Medical College and Hospital at Tainan, Taiwan, R.O.C.