1. Centre for Biophotonics, LEC, Lancaster University, Lancaster, LA1 4YQ, UK
2. Department of Obstetrics & Gynaecology, The Adelaide & Meath Hospital, Ireland
3. Department of Obstetrics & Gynecology, Ioannina University Hospital, Greece
4. Centre for Biophotonics, LEC, Lancaster University, Lancaster, LA1 4YQ, UK.