1. Report of the WHO-China Joint Mission on Coronavirus Disease 2019 (COVID-19);World Health Organization (WHO),2020
2. Rolling Updates on Coronavirus Diseases (COVID-19);World Health Organization (WHO),2020
3. Coronavirus Disease (COVID-19) Situation Report-117. Data As Received by WHO From National Authorities by 10:00 CEST, 16 May 2020;World Health Organization (WHO),2020
4. Infection Prevention and Control for COVID-19 in Healthcare Settings – Third Update. 13 May 2020;European Centre for Disease Prevention and Control (ECDC),2020
5. Coronavirus Disease 2019 (COVID-19) and pregnancy: what obstetricians need to know;Rasmussen;Am. J. Obstet. Gynecol.,2020