Causes of vitamin B12 and folate deficiency. Causes of vitamin B12 and folate deficiency. Causes of vitamin B12 and folate deficiency. Causes of vitamin B12 and folate deficiency. Causes of vitamin B12 and folate deficiency. PubMed:18709879 Causes of vitamin B12 and folate deficiency. Causes of vitamin B12 and folate deficiency. Causes of vitamin B12 and folate deficiency. (PubMed) Causes of vitamin B12 and folate deficiency. Causes of vitamin B12 and folate deficiency. Causes of vitamin B12 and folate deficiency. Causes of vitamin B12 and folate deficiency. Causes of vitamin B12 and folate deficiency. Causes of vitamin B12 and folate deficiency. have the biggest folate intakes Causes of vitamin B12 and folate deficiency. Causes of vitamin B12 and folate deficiency.