Critically appraise one of the following papers, and assess the extent to which there is a causal association between the main study factor(s) and the outcome.
Leon DA, Lithell HO, Vagero et al. Reduced fetal growth rate and increased risk of death from ischaemic heart disease: cohort study of 15 000 Swedish men and women born 191529. BMJ. 1998; 317: 241-245.
Hassan MM, Bondy ML, Wolff MD, et al. Risk factors for pancreatic cancer: Case-control study. American Journal of Gastroenterology. 2007; 102:2696-2707.
Wu Z, Luo W, Sullivan SG, et al. Evaluation of a needle social marketing strategy to control HIV among injecting drug users in China. AIDS. 2007; 21(suppl 8):S115-S122.
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