Decrease in gastric cancer susceptibility by MTHFR C677T polymorphism in Ardabil Province, Iran - HOSSEINI-ASL, S Saied; POURFARZI, Farhad; BARZEGAR, Abazar; MAZANI, Mohammad; FARAHMAND, Nima; NIASTI, Elham; YAZDANBOD, Abbas; DIDEVAR, Reza; AKHAVAN, Homa; MALEKZADEH, Reza (Turkish Journal of Gastroenterology, 2013)