[1] Maastricht Univ, UNU Maastricht Econ & Social Res Inst Innovat & T, Maastricht, Netherlands
[2] Maastricht Univ, Fac Hlth Med & Life Sci, Dept Hlth Serv Res, Maastricht, Netherlands
[3] Univ Utrecht, Sch Governance, Fac Law Econ & Governance, Utrecht, Netherlands
[4] World Hlth Org, Dept Sexual & Reprod Hlth & Res, Geneva, Switzerland
[5] Univ New South Wales UNSW, Natl Perinatal Epidemiol & Stat Unit NPESU, Ctr Big Data Res Hlth, Sydney, NSW, Australia
[6] Univ New South Wales UNSW, Sch Clin Med, Sydney, NSW, Australia
[7] Univ Lisbon, Clin Obstet & Gynaecol, Fac Med, Lisbon, Portugal