1. World Health Organization. C archived: WHO timeline—COVID‐19. 2020.http://www.who.int/news-room/detail/27-04-2020-who-timeline---covid-19
2. Perinatal depressive and anxiety symptoms of pregnant women during the coronavirus disease 2019 outbreak in China
3. World Health Organization. Coronavirus disease 2019 (COVID‐19). Situation report‐67. World Health Organization. 2020.https://apps.who.int/iris/bitstream/handle/10665/331613/nCoVsitrep27Mar2020-eng.pdf?sequence=1&isAllowed=y
4. Centers for Disease Control and Prevention. (2020). Coronavirus disease 2019 (COVID‐19). US Department of Health and Human Services. 2020.https://www.cdc.gov/coronavirus/2019-ncov/about/transmission.html
5. Epidemiology, causes, clinical manifestation and diagnosis, prevention and control of coronavirus disease (COVID-19) during the early outbreak period: a scoping review