1. World Health Organization. Draft landscape and tracker of COVID‐19 candidate vaccines.https://www.who.int/publications/m/item/draft-landscape-of-covid-19-candidate-vaccines.2021.
2. China grants conditional approval for first COVID vaccine.http://english.nmpa.gov.cn/2020-12/31/c_579192.htm.2020.
3. NMPA conditionally approves COVID‐19 vaccine developed by Sinopharm's Wuhan Institute.http://english.nmpa.gov.cn/2021-02/27/c_597152.htm.2021.
4. Sinovac COVID‐19 vaccine granted conditional market approval in China.http://english.nmpa.gov.cn/2021-02/07/c_588422.htm.2021.
5. Pfizer and BioNTech Receive authorization in the European Union for COVID‐19 vaccine.https://www.pfizer.com/news/press-release/press-release-detail/pfizer-and-biontech-receive-authorization-european-union.2020.