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APA Citation
Zhu, Y., Hubbard, R. A., Chubak, J., Roy, J., & Mitra, N. (2021). core concepts in pharmacoepidemiology: Violations of the positivity assumption in the causal analysis of observational data: Consequences and statistical approaches. Pharmacoepidemiology and drug safety, 30(11), 1471–1485. http://access.bl.uk/ark:/81055/vdc_100142343533.0x00003a