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The dual HPLC and mass-spec approach is the correct standard, since purity and identity are separate questions and a compound can be pure yet incorrectly identified
The exclusion criteria for this review would be all secondary literature and any original articles written and submitted in languages other than English
Checking the Vitamin B12 Status with an MMA Urine Test High vitamin B12 blood levels which have not been caused by a mistimed test should always be followed up by an official B12 status check
-Resume normal activities as tolerated
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