Although cobalamin (vitamin B 12 ) deficiency was described over a century ago, it is still difficult to establish the correct diagnosis and prescribe the right treatment. Symptoms related to vitamin B 12 deficiency may be diverse and vary from neurologic to psychiatric. A number of individuals with vitamin B 12 deficiency may present with the classic megaloblastic anemia.
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Wolffenbuttel et al. (2019) studied this question.
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