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APA Citation
Krishnamoorthy, V., Wong, D. J., Wilson, M., Raghunathan, K., Ohnuma, T., McLean, D., Moonesinghe, S. R., & Harris, S. K. (2020). causal inference in perioperative medicine observational research: part 1, a graphical introduction. British journal of anaesthesia, 125, 393–397. http://access.bl.uk/ark:/81055/vdc_100106944736.0x000062