Global, regional, and national levels of maternal mortality, 1990

Maternal mortality ratio in China from 1990 to 2019: trends, causes and correlations, BMC Public Health

Epidemiological study of maternal death in Assam - Clinical Epidemiology and Global Health

Maternal mortality in Bangladesh: Who, when, why, and where? A national survey-based analysis — JOGH

Historical and Recent Changes in Maternal Mortality Due to Hypertensive Disorders in the United States, 1979 to 2018

SciELO - Brasil - Maternal Mortality in Brazil, 1990 to 2019: a systematic analysis of the Global Burden of Disease Study 2019 Maternal Mortality in Brazil, 1990 to 2019: a systematic analysis

Global, regional, and national levels and causes of maternal mortality during 1990–2013: a systematic analysis for the Global Burden of Disease Study 2013 - The Lancet

Global, regional, and national levels and trends in maternal mortality between 1990 and 2015, with scenario-based projections to 2030: a systematic analysis by the UN Maternal Mortality Estimation Inter-Agency Group - The Lancet

Global, regional, and national burden of diseases and injuries for adults 70 years and older: systematic analysis for the Global Burden of Disease 2019 Study

Methodology, WHO

Number of maternal deaths globally and regionally

Maternal mortality in Nigeria: A consideration of infection control factor

Reversing The Rise In Maternal Mortality

Global, regional, and national levels of maternal mortality, 1990–2015: a systematic analysis for the Global Burden of Disease Study 2015 - The Lancet

Global, regional, and national levels of maternal mortality, 1990–2015: a systematic analysis for the Global Burden of Disease Study 2015 - The Lancet