1 Department of Obstetrics and Gynaecology, Basildon and Thurrock University Hospitals NHS Foundation Trust, Nethermayne, Basildon, Essex, SS16 5NL, UK. Amaju.Ikomi@btuh.nhs.uk.
2 Department of Obstetrics and Gynaecology, Basildon and Thurrock University Hospitals NHS Foundation Trust, Nethermayne, Basildon, Essex, SS16 5NL, UK.
3 Department of Obstetrics and Gynaecology, Southend University Hospital NHS Foundation Trust, Prittlewell Chase, Westcliff-on-Sea, Essex, UK.