1. Keashly, L. in Special Topics and Particular Occupations, Professions and Sectors Vol. 4 (eds D’Cruz, P., Noronha, E., Keashly, L. & Tye-Williams, S.) 1–77 (Springer, 2019).
2. Olsthoorn, L. H. et al. PhDnet Survey Report 2019 https://doi.org/10.17617/2.3243876 (2019).
3. Moss, S. E. & Mahmoudi, M. eClinicalMedicine 40, 101121 (2021).
4. Hayter, C. S. & Parker, M. A. Res. Policy 48, 556–570 (2019).