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This study was funded by CNPq and Federico Foundation.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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de Carvalho, J.F., Silva, D.N.F. Serum levels of vitamin B12 (cobalamin) in fibromyalgia. Rheumatol Int 36, 741–742 (2016). https://doi.org/10.1007/s00296-016-3454-y
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DOI: https://doi.org/10.1007/s00296-016-3454-y