1. University Hospitals of Birmingham; Department of Obstetrics and Gynaecology; Birmingham UK
2. Newcastle University; Institute of Health & Society; Baddiley-Clark Building, Richardson Road Newcastle upon Tyne UK NE2 4AX
3. University of the Philippines; Department of Surgery; Manila Philippines
4. Newcastle University; Faculty of Medical Sciences; Newcastle upon Tyne UK
5. University of Leicester; Department of Health Sciences, College of Life Sciences; University Road Leicester Leicestershire UK LE1 7RH