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After publication it was noted that this article [1] addresses the same research question and reports highly similar results and conclusions as a publication in the Journal of Arthroplasty [2]. There is substantial text overlap between the publications. The two articles were authored by different research groups and were under consideration during overlapping periods per the published article information. When asked about the similarities, the corresponding author for the PLOS ONE article commented that the work had been conducted in collaboration between three hospitals including the institution listed in [2], and that the authors of the two articles diverged in their work prior to publication. The PLOS ONE article [1] specifies that it reports a single-department study, and no collaboration or related work was declared for the PLOS ONE submission. In reviewing this matter, we identified additional concerns for the PLOS ONE article [1]:

Retraction: Serum Levels of 25-Hydroxyvitamin D and Functional Outcome among Postmenopausal Women with Hip Fracture