[1] Leiden Univ, Fac Sci, Dept Mol Genet, NL-2333 CC Leiden, Netherlands
[2] Kings Coll London, Inst Dent, Head & Neck Oncol Grp, London WC2R 2LS, England
[3] Aarhus Univ, Inst Mol Biol, Aarhus, Denmark
[4] Univ Laval, Canc Res Ctr, Quebec City, PQ, Canada
[5] Univ Vet Med, Res Inst Virol & Biomed, Vienna, Austria
[6] Netherlands Canc Inst, Amsterdam, Netherlands