BMC Health Services Research, Volume 20, No. 1, Year 2020
PLoS ONE, Volume 15, No. 2, Year 2020
BMC Pregnancy and Childbirth, Volume 20, No. 1, Year 2020
BMC Pregnancy and Childbirth, Volume 18, Year 2018
BMC Pregnancy and Childbirth, Volume 18, Year 2018