@article{RN383,
   author = {Osokogu, O. U. and Khan, J. and Nakato, S. and Weibel, D. and de Ridder, M. and Sturkenboom, M. C. J. M. and Verhamme, K.},
   title = {Choice of time period to identify confounders for propensity score matching, affected the estimate: a retrospective cohort study of drug effectiveness in asthmatic children},
   journal = {Journal of Clinical Epidemiology},
   volume = {101},
   pages = {107-115.e3 , DOI = 10.1016/j.jclinepi.2018.01.008},
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   year = {2018},
   type = {Journal Article}
}

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