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APA Citation
Cousens, S., Hargreaves, J., Bonell, C., Armstrong, B., Thomas, J., Kirkwood, B. R., & Hayes, R. (2011). alternatives to randomisation in the evaluation of public-health interventions: statistical analysis and causal inference. Journal of epidemiology and community health, 65(7), 576–581. http://access.bl.uk/ark:/81055/vdc_100135536462.0x000029