WHO systematic review of maternal mortality and morbidity: methodological issues and challenges
A Metin Gülmezoglu
,
Lale Say
,
Ana Pilar Betrán
,
A Metin Gülmezoglu
,
Lale Say
,
Ana Pilar Betrán
,
José Villar
,
Gilda Piaggio
2004
BMC Medical Research Methodology
108 citations