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HARVARD Citation
Pennefather, P. et al. (1999). Bias due to incomplete follow up in a cohort study. British journal of ophthalmology. 83 (6), pp. 643-645. [Online].
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Pennefather, P. et al. (1999). Bias due to incomplete follow up in a cohort study. British journal of ophthalmology. 83 (6), pp. 643-645. [Online].