1. Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea.
2. Department of Medical Device Management and Research, SAIHST, Sungkyunkwan University, Seoul 06351, Korea.
3. Department of Orthopedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea.
4. Department of Preventive Medicine, Kyung Hee University School of Medicine, Seoul 02454, Korea.