Global citimpact: 2.57 Researcher at Department of Orthopedic Surgery, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, South . E-mail address for B.H. Lee: . E-mail address for S. Lim: . E-mail address for S.H. Moon: . E-mail address for J.-O. Park: . E-mail address for H.-S. Kim: . E-mail address for H.-M. Lee: .