1. Department of Anesthesiology and Pain Medicine, College of Medicine, Wonkwang University, Iksan, Korea.
2. Department of Oral and Maxillofacial Surgery, Daejeon Dental Hospital, Wonkwang University, Daejeon, Korea.
3. Department of Surgery, College of Medicine, Wonkwang University, Iksan, Korea.
4. Department of Surgery, Wonkwang-Gusan Medical Center, Wonkwang University, Gunsan, Korea.
5. Department of Orthopedic Surgery, Hallym University College of Medicine, Kangnam Sacred Heart Hospital, Seoul, Korea.
6. Department of Obstetrics and Gynecology, College of Medicine, Wonkwang University, Iksan, Korea.
7. Department of Urology, Wonkwang-Gusan Medical Center, Wonkwang University, Gunsan, Korea.