Case series of four secondary mucormycosis infections in COVID-19 patients, the Netherlands, December 2020 to May 2021 Buil, Jochem B and van Zanten, Arthur R H and Bentvelsen, Robbert G and Rijpstra, Tom A and Goorhuis, Bram and van der Voort, Sanne and Wammes, Linda J. and Janson, Jeroen A and Melchers, Max and Heusinkveld, Moniek and Melchers, Willem J G and Kuijper, Ed J and Verweij, Paul E, Eurosurveillance, 26, 2100510 (2021), https://doi.org/10.2807/1560-7917.ES.2021.26.23.2100510