1. COVID-19 vaccine effectiveness and safety. (2022). Accessed. June 6, 2022: https://www.cdc.gov/mmwr/covid19_vaccine_safety.html.
2. Syncope;Grossman SA,2022
3. Postlicensure safety surveillance for quadrivalent human papillomavirus recombinant vaccine;Slade BA;JAMA,2009
4. Syncope and seizures following human papillomavirus vaccination: a retrospective case series;Crawford NW;Med J Aust,2011
5. Syncope after vaccination --- United States, January 2005--July 2007;Centers for Disease Control and Prevention (CDC);MMWR Morb Mortal Wkly Rep,2008