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APA Citation
Hjellvik, V., De Bruin, M. L., Samuelsen, S. O., Karlstad, Ø., Andersen, M., Haukka, J., Vestergaard, P., de Vries, F., & Furu, K. (2019). adjusting for unmeasured confounding using validation data: Simplified two‐stage calibration for survival and dichotomous outcomes. Statistics in medicine, 38, 2719–2734. http://access.bl.uk/ark:/81055/vdc_100086210627.0x000045