1. Pregnancy of unknown location: a consensus statement of nomenclature, definitions, and outcome;Barnhart;Fertil Steril,2011
2. Gemzell-Danielsson, K , Fiala, C , Agostini, A et al. Medical Abortion Beyond the 1st Trimester Including Fetal Death in Utero. A Practical Guide for Health Professionals. 2015.
3. National Institute for Health and Care Excellence. Abortion Care. Abortion Care Guidance (NG140) 2019. Published: September 25, 2019.
4. New NICE abortion care guidance: what does it mean for antibiotic use?;Blee;BMJ Sex Reprod Health,2020