1 Department of Obstetrics and Gynaecology, Guy's and St Thomas' Hospital, Westminster Bridge Road, London, SE1 7EH, United Kingdom.
2 Department of Histopathology, Guy's and St Thomas' Hospital, Westminster Bridge Road, London, SE1 7EH, United Kingdom.
3 Department of Obstetrics and Gynaecology, Guy's and St Thomas' Hospital, Westminster Bridge Road, London, SE1 7EH, United Kingdom; Department of Surgery and Cancer, Imperial College London, Hammersmith Campus, Du Cane Road, London, W12 0HS, United Kingdom. c: School of Medical Education, Faculty of Life Sciences and Medicine, King's College, Guy's Campus, St Thomas Street, London, SE1 9RT, United Kingdom; School of Medical Education, Faculty of Life Sciences and Medicine, King's College, Guy's Campus, St Thomas Street, London, SE1 9RT, United Kingdom. Electronic address: ahmad.sayasneh@kcl.ac.uk.