Travel and venous thrombosis: an exercise in thinking about bias.

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@article{Vandenbroucke2009TravelAV, title={Travel and venous thrombosis: an exercise in thinking about bias.}, author={J . P . Vandenbroucke and Suzanne C . Cannegieter and Frits R Rosendaal}, journal={Annals of internal medicine}, year={2009}, volume={151 3}, pages={212-3} }