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APA Citation
Egan, M., McGill, E., Penney, T., Meier, P. S., Savona, N., de Vocht, F., Popay, J., Cummins, S., Smith, R., White, M., Er, V., & Petticrew, M. (n.d.). complex systems for evaluation of public health interventions: a critical review. Lancet, 392, S31–. http://access.bl.uk/ark:/81055/vdc_100073405800.0x00004f