Toxicology in the twenty-first century

1 Gilliland FD , Li YF , Saxon A , Diaz-Sanchez D. Effect of glutathione-Stransferase M1 and P1 genotype on xenobiotic enhancement of allergic responses: randomised, placebo-controlled crossover study . Lancet 2004; 363: 119-125 .

2 Romieu I , Sienra-Monge JJ , Ramirez-Aguilar M , MorenoMacias H , Reyes-Ruiz NI , Estela del Rio-Navarro N et al. Genetic polymorphism of GSTM1 and antioxidant supplementation influence lung function in relation to ozone exposure in asthmatic children in Mexico City . Thorax 2004; 59: 8-10 .

3 Townsend CL , Maynard RL . Effects on health of prolonged exposure to low concentrations of carbon monoxide . Occup Environ Med 2002; 59: 708-711 .

4 Hill AB . The environment and disease: association or causation? Proc R Soc Med 1965; 9: 295-300 .