RT Journal Article SR Electronic T1 Response: Re: Effectiveness of Vitamin B12 in Treating Recurrent Aphthous Stomatitis: A Randomized, Double-Blind, Placebo-Controlled Trial JF The Journal of the American Board of Family Medicine JO J Am Board Fam Med FD American Board of Family Medicine SP 591 OP 591 DO 10.3122/jabfm.2009.05.090161 VO 22 IS 5 A1 Ilia Volkov YR 2009 UL http://www.jabfm.org/content/22/5/591.1.abstract AB