1. The vaccine adverse event reporting system (VAERS);Chen;Vaccine,1994
2. Public Health England. Quarterly vaccination coverage statistics for children aged up to five years in the UK (COVER programme): October to December 2015. Heal. Prot. Rep., vol. 10, no. 12, 2016.
3. Tracking mothers attitudes to childhood immunisation 1991–2001;Yarwood;Vaccine,2005
4. Office for National Statistics. [ARCHIVED CONTENT] UK Government Web Archive – The National Archives. Available: [accessed 22.06.16].
5. Office for National Statistics. UK labour market, December 2014. ONS statistical bulletin. Available: ; 2014 [accessed 23.06.16].