Retraction to: Archives of Orthopaedic and Trauma Surgery (2018) 138:1173–1178 https://doi.org/10.1007/s00402-018-2969-y

The Editor-in-Chief has retracted this article because an investigation by the Institutional Review Board, Gil Medical Center, College of Medicine, Gachon University, has concluded that the study reported by the authors did not match the research proposal submitted to the Institutional Review Board for approval. Young Hak Roh stated on behalf of all co-authors that they do not agree with this retraction.