Reference:
1. Combined hormonal contraception. Clinical Effectiveness Unit, October 2011. http://www.fsrh.org/pdfs/CEUGuidanceCombinedHormonalContraception.pdf
2. Sinxadi P, Blockman M, Prescribing combined oral contraceptives for women with pre-existing medical conditions. SA Pharmaceutical Journal – Jan/Feb 2007:20-4
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