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Ohishi, H., Nakamura, Y., Kishiya, M. et al. Spontaneous femoral neck fracture associated with a low serum level of vitamin D. J Orthop Sci 18, 496–499 (2013). https://doi.org/10.1007/s00776-011-0171-y
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DOI: https://doi.org/10.1007/s00776-011-0171-y