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London: Academic Press (Elsevier)
Even so, the Nature Medicine report is very important, Mozaffarian says
An error in any one of those three elements can trigger an automatic claim denial before a human reviewer ever sees the claim
The first paper you see is from 1971 this discusses excessive prescription of B12 and seeks to standardise B12 treatment
Unlike oral supplements that have to go through the digestive system before reaching the bloodstream, a vitamin B12 injection delivers the nutrient directly into the blood
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