Homocysteine, vitamin 'B IND. 12', red blood cell folate, and C677T MTHFR mutation in non-diabetic dialysis patients - D´Avila, Ronaldo; Guerra, Enio Marcio Maia; Almeida, Fernando Antonio de; D'Almeida, Vânia; Hirata, Rosario Dominguez Crespo; Kohlmann Jr., Osvaldo; Ribeiro, Artur Beltrame; Tavares, Agostinho (Dialysis and Transplantation, 2004)