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This is a reply to the letter that can be found at doi:10.1007/s00198-007-0342-z.
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Bolland, M.J., Grey, A.B. & Reid, I.R. Vitamin D sufficiency: reply to letter by Heaney. Osteoporos Int 18, 835–836 (2007). https://doi.org/10.1007/s00198-007-0344-x
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DOI: https://doi.org/10.1007/s00198-007-0344-x