ISUOG Interim Guidance on coronavirus disease 2019 (COVID‐19) during pregnancy and puerperium: information for healthcare professionals – an update. (1st June 2020) - Poon, L. . C.; Yang, H.; Dumont, S.; Lee, J. C. S.; Copel, J. A.; Danneels, L.; Wright, A.; Costa, F. Da Silva; Leung, T. Y.; Zhang, Y.; Chen, D.; Prefumo, F.