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Description
Zettler is not so sure

Jims testimony before Congress in the mid-1990s changed the workings of federal disability benefits

Prolonged maintenance: Prolonged Maintenance-Picture Courtesy: Beauty Worx Aesthetics When you witness the low levels of cobalamin in cats, after withdrawal of vitamin b12 injection therapy, this indicates that your cat needs prolonged maintenance by administering dose every 2-4 weeks

So its common to see lab testing combine the two
