1. Drugs.com. U.S. pharmaceutical sales—Q4 2013. www.drugs.com/stats/top100/2013/q4/units (accessed 2014 Mar 13).
2. Health & Social Care Information Centre. Prescription cost analysis—England, 2011. www.hscic.gov.uk/pubs/prescostanalysis2011 (accessed 2014 Mar 17).
3. Bauer DC McPhee SJ . Thyroid disease. http://accessmedicine.mhmedical.com/content.aspx?bookid=339&Sectionid=42811320 (accessed 2014 Feb 26).
4. The incidence of thyroid disorders in the community: a twenty-year follow-up of the Whickham Survey;Vanderpump;Clin Endocrinol,1995
5. Treatment for primary hypothyroidism: current approaches and future possibilities;Chakera;Drug Des Dev Ther,2012