RT Journal Article SR Electronic T1 Case report: Recurrent aphthous stomatitis responds to vitamin B12 treatment. JF Canadian Family Physician JO Can Fam Physician FD The College of Family Physicians of Canada SP 844 OP 845 VO 51 IS 6 A1 Ilia Volkov A1 Inna Rudoy A1 Unes Abu-Rabia A1 Tawfek Masalha A1 Rafik Masalha YR 2005 UL http://www.cfp.ca/content/51/6/844.abstract AB