Oral or Parenteral Therapy for B12 Deficiency
Lancet 352:1721-1722, Elia,M., 1998
Diseases of the Nervous System Caused by Nutritional Deficiency, Pyridoxine (Vitamin B6 Deficiency)
Adams & Victors Principles of Neurology Chp 41, pg 1171, Ropper, A.H.,et al, 2014