Cordey, Sarah, Moncrieff, Gill, Cull, Joanne, Sarian, Arni, the ASPIRE‐COVID 19 Collaborative Group,, "‘There's only so much you can be pushed’: Magnification of the maternity staffing crisis by the 2020/21 COVID‐19 pandemic", BJOG: An International Journal of Obstetrics & Gynaecology, 2022