[1] Inst Canc Res, Sect Mol Carcinogenesis, Sutton, Surrey, England
[2] German Inst Human Nutr, Dept Toxicol, Nuthetal, Germany
[3] Canc Res UK Ctr Canc Therapeut, Inst Canc Res, Sutton, Surrey, England
[4] Kanagawa Inst Technol, Dept Appl Chem, Atsugi, Japan