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APA Citation
Sperrin, M., Martin, G. P., Pate, A., Van Staa, T., Peek, N., & Buchan, I. (2018). using marginal structural models to adjust for treatment drop‐in when developing clinical prediction models. Statistics in medicine, 37, 4142–4154. http://access.bl.uk/ark:/81055/vdc_100072168005.0x000042