1. Obstetrics & Gynaecology Department; Leigh Infirmary, Wrightington, Wigan and Leigh NHS Foundation Trust; Leigh UK
2. Obstetrics & Gynaecology Department; Royal Oldham Hospital; Pennine Acute Hospitals NHS Trust; Oldham UK
3. Newcastle Fertility Centre at Life; Newcastle UK
4. Mapi Group; Houten the Netherlands
5. School of Health Sciences; City University London; London UK