1. Clinical Development, Merck Sharp & Dohme Corp., Whitehouse Station, NJ, USA.
2. Department of Anesthesiology and Pain Medicine, College of Medicine, Hanyang University, Seoul, Korea.
3. Department of Anesthesiology and Pain Medicine, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Anesthesiology and Pain Medicine, College of Medicine, Kyung Hee University Hospital, Seoul, Korea.
5. Department of Anesthesiology and Pain Medicine, Korea University Anam Hospital, Seoul, Korea.
6. Department of Anesthesiology and Pain Medicine, Seoul National University Hospital, Seoul, Korea.
7. Department of Anesthesiology and Pain Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
8. Department of Anesthesiology and Pain Medicine, The Catholic University of Korea, School of Medicine, St. Mary's Hospital, Seoul, Korea.