1. WHO | Pneumonia of unknown cause – China;World Health Organization,2020
2. Genomic characterisation and epidemiology of 2019 novel coronavirus: implications for virus origins and receptor binding;Lu;Lancet (London, England),2020
3. WHO announces COVID-19 outbreak a pandemic;World Health Organization,2020
4. COVID-19 situation reports;World Health Organization,2020
5. COVID19 during pregnancy: a systematic review of reported cases;Della Gatta;Am J Obstet Gynecol,2020