1. Bias and causal associations in observational research;Grimes;Lancet,2002
2. History of bias;Vineis;Soz Praventivmed,2002
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4. Low mortality rates in industrial cohort studies due to selection for work and survival in the industry;Fox;Br J Prev Soc Med,1976
5. Some observations on the healthy worker effect;Carpenter;Br J Ind Med,1987