Serum total homocysteine levels and the prevalence of folic acid deficiency and C677T mutation at the MTHFR gene in an indigenous population of Amazonia: the relationship of homocysteine with other cardiovascular risk factors - Tavares, Edelweiss F.; Vieira-Filho, João P. B.; Andriolo, Adagmar; Perez, Ana B. A.; Vergani, Naja; Sañudo, Adriana; Gimeno, Suely Godoy Agostinho; Franco, Laércio Joel (Ethnicity and Disease, 2004)