Geographical and ethnic variation of the 677C>T allele of 5, 10 methylenetetrahydrofolate reductase (MTHFR): findings from over 7000 newborns from 16 areas world wide. Issue 8 (14th August 2003) - Wilcken, B; Bamforth, F; Li, Z; Zhu, H; Ritvanen, A; Redlund, M; Stoll, C; Alembik, Y; Dott, B; Czeizel, A E; Gelman-Kohan, Z; Scarano, G; et al.