Austin, P. ., van Klaveren, D. ., Vergouwe, Y. ., Nieboer, D. ., Lee, D. ., & Steyerberg, E. . Validation of prediction models: examining temporal and geographic stability of baseline risk and estimated covariate effects. Diagnostic and Prognostic Research, 1, 12. https://doi.org/10.1186/s41512-017-0012-3 (Original work published 2017)

Jaja, B. ., Saposnik, G. ., Lingsma, H. ., Macdonald, E. ., Thorpe, K. ., Mamdani, M. ., … SAHIT, collaboration. . (2018). Development and validation of outcome prediction models for aneurysmal subarachnoid haemorrhage: the SAHIT multinational cohort study. BMJ (Clinical Research ed.), 360, j5745. (Original work published 2018)