World distribution of the T833C/ 844INS68 CBS in cis double mutation: a reliable anthropological marker - Pepe, G; Vanegas, OC; Rickards, O; Giusti, B; Comeglio, P; Brunelli, T; Marcucci, R; Prisco, D; Gensini, GF; Abbate, R (Hum Genet, 1999)