BJOG
https://obgyn.onlinelibrary.wiley.com/toc/14710528/2019/126/1
Journal_of_Midwifery_&_Women-s_Health
https://onlinelibrary.wiley.com/journal/15422011
Journal_of_Obstetrics_and_Gynaecology_Research
https://obgyn.onlinelibrary.wiley.com/journal/14470756
TOG