1. Measuring the quality of medical care: second revision of tables of indexes;Rutstein;N Engl J Med,1980
2. Avoidable deaths;Holland;Lancet,1988
3. Is estimating maternal mortality useful?;Buekens;Bull World Health Organ,2001
4. Maternal mortality in developed countries: not just a concern of the past;Atrash;Obstet Gynecol,1995
5. Trends in maternal mortality 2000 to 2017: estimates by WHO, UNICEF, UNFPA, WorldBank Group and the United Nations Population Division;WHO,2019