Katholieke Univ Leuven, Expt Oncol Lab, Louvain, BelgiumUniv E Anglia, Sch Biol Sci, Biomed Res Ctr, Norwich NR4 7TJ, Norfolk, EnglandVanderbilt Univ, Sch Med, Dept Med, Nashville, TN 37212 USABarts & London Queen Marys Sch Med & Dent, William Harvey Res Inst, London, EnglandUniv Southampton, Div Human Genet, Southampton SO9 5NH, Hants, EnglandShanghai Canc Inst, Dept Epidemiol, Shanghai, Peoples R ChinaUNESP, Fac Odontol Sao Jose Dos Campos, Dept Biociencias & Diagnost Bucal, Sao Jose Dos Campos, BrazilUNESP, Fac Odontol Sao Jose Dos Campos, Dept Biociencias & Diagnost Bucal, Sao Jose Dos Campos, Brazi