Nursing before and after COVID-19 : outflows, inflows and self-employment / Guyonne Kalb (The University of Melbourne, IZA and LCC - The ARC Centre of Excellencefor Children and Families over the Life Course), Jordy Meekes (Leiden University, IZA, LCC - The ARC Centre of Excellence for Childrenand Families over the Life Course and Utrecht University) ; IZA Institute of Labor Economics