1. What is Epidemiology? | Teacher Roadmap | Career Paths to Public Health | CDC. https://www.cdc.gov/careerpaths/k12teacherroadmap/epidemiology.html. Published 10 May 2019. Accessed 15 June 2020
2. Fedak, K.M., Bernal, A., Capshaw, Z.A., Gross, S.: Applying the Bradford Hill criteria in the 21st century: how data integration has changed causal inference in molecular epidemiology. Emerg. Themes. Epidemiol. 12(1), 14 (2015). https://doi.org/10.1186/s12982-015-0037-4
3. Bias, D.-R.: J. Epidemiol. Commun. Health 58(8), 635–641 (2004). https://doi.org/10.1136/jech.2003.008466
4. Selection bias. https://www.iwh.on.ca/what-researchers-mean-by/selection-bias. Accessed 15 June 2020
5. McCaffrey, D.F., Ridgeway, G., Morral, A.R.: Propensity score estimation with boosted regression for evaluating causal effects in observational studies. Psychol. Methods 9(4), 403–425 (2004). https://doi.org/10.1037/1082-989X.9.4.403