The research sample will be stored in a separate vial to the clinical sample at the respective recruitment sites. It is stored at 4 degrees Celsius and then centrifuged at 300 x g for 10 minutes within 6 hours of collection. The AF supernatant will be taken off and stored in a separate tube. Both the cellular portion and the supernatant will be frozen and stored at - 80°C. The Sydney recruitment site will transport the specimens to the University of Melbourne laboratory at the Mercy Hospital for Women on dry ice, where they will be processed. All samples will be given a study sample ID number before transport to the University of Melbourne research lab at the Mercy Hospital for Women to protect the participants privacy.