1. Clinical practice;Barnhart;Ectopic pregnancy N Engl J Med,2009
2. Trends in ectopic pregnancy rates following assisted reproductive technologies in the UK: a 12-year nationwide analysis including 160 000 pregnancies;Santos-Ribeiro;Hum Reprod,2016
3. Risk factors for ectopic pregnancy: a comprehensive analysis based on a large case–control, population-based study in France;Bouyer;Am J Epidemiol,2003
4. Trends in the diagnosis and treatment of ectopic pregnancy in the United States;Hoover;Obstet Gynecol,2010
5. Pregnancies of unknown location: consensus statement;Condous;Ultrasound Obstet Gynecol,2006