Hølge-Hazelton, B., Zacho Borre, L., Kjerholt, M., McCormack, B. & Rosted, E. 2021, 'The differences in experiences among multi-level healthcare leaders, between the first and the second wave of the COVID-19 pandemic: Two cross-sectional studies compared', Journal of Healthcare Leadership, 13, pp. 209-219. https://doi.org/10.2147/JHL.S326019