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National Library of Medicine (US), MedlinePlus
B12 levels between 200 and 300 pg/mL are considered borderline low
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Pernicious Anaemia appears to be a "Holy Grail" diagnosis here, and the medical profession seem far more comfortable saying "B12 deficiency" without giving a reason
He had tried cortisone injections and anti-inflammatories, but the pain kept returning
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