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Injection Technique General subcutaneous guidance from clinical best-practice resources [8] [12]
Being me (sciencey minded) I've done my own trials on myself with in-date and out-of-date ampoules and found no difference
Undetected vitamin B12 deficiency due to false normal assay ...ncbi.nlm.nih.gov articles PMC3827408 by E Scarpa 2013 Cited by 25 Although measurement of vitamin B12 levels is the gold standard for the diagnosis of B12 deficiency some reports do exist concerning difficulties in its assay
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