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Description
In the group with a history of gastrectomy, 1 patient was taking hypnotics and anti-parkinsonism drugs, 1 patient had a history of chemotherapy, and 1 patient was taking hypnotics and had a history of chemotherapy

The causes of B12 deficiency can be subdivided into congenital and acquired (Table 1)

Ruscin JM, Page RL Ann Pharmacother

World J Diabetes