TY - JOUR T1 - Elaboration on vitamin B12 JF - Canadian Family Physician JO - Can Fam Physician SP - 321 LP - 321 VL - 60 IS - 4 AU - Constantine K. Vitou Y1 - 2014/04/01 UR - http://www.cfp.ca/content/60/4/321.2.abstract N2 - ER -