1. World Health Organization. Sickle-cell disease and other haemoglobin disorders. Fact sheet No. 308 2011. http://www.who.int/mediacentre/factsheets/fs308/en/index.html date accessed 7 March, 2012.
2. World Health Organization. 59th World Health Assembly agenda item 11.4.2006. http://apps.who.int/gb/ebwha/pdf_files/WHA59-REC3/WHA59_REC3-en.pdf date accessed 7 March 2012.
3. NHS Sickle cell and thalassaemia screening programme. Standards for linked antenatal and newborn screening programme, Second Edition, October 2011. http://sct.screening.nhs.uk/standards date accessed 3 April 2012.
4. Antenatal care: Routine care for the healthy pregnant woman Clinical Guideline 6;NICE,2003
5. Department of Health National Service Framework on Maternity and Child Care; 2004. http://www.dh.gov.uk/PolicyAndGuidance/HealthAndSocialCareTopics/ChildrenServices/ChildrenServicesInformation/fs/en date accessed 3 April 2012.