Prevalence of prothrombin G20210A, factor V G1691A (Leiden), and methylenetetrahydrofolate reductase (MTHFR) C677T in seven different populations determined by multiplex allele-specific PCR - Hessner, M; Luhm, R; Pearson, S; Endean, D; Friedman, K; Montgomery, R (Thromb Haemost, 1999)