title: Diagnosis of vitamin B 12 deficiency in psychiatric patients.
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000097:blood*; D008875:Middle Aged; D014805:Vitamin B 12 / Q000097:blood; D014806:Vitamin B 12 Deficiency / Q000175:diagnosis*
chemical_list: D014805:Vitamin B 12