1. Vitamin B12 deficiency;Green;Nat. Rev. Dis. Prim.,2017
2. Vitamin B12 Deficiency : recognition and management;Langan Robert C;Am. Fam. Physician,2017
3. Cobalamin deficiency in elderly patients: a personal view;Andrès;Curr. Gerontol. Geriatr. Res,2008
4. Vitamin B12 deficiency - a 21st century perspective;Shipton;Clin. Med. J. R. Coll. Physicians London.,2015
5. Vegetarian lifestyle and monitoring of vitamin B-12 status;Herrmann;Clin. Chim. Acta,2002