1. University Hospital of North Staffordshire; Maternity Centre; Newcastle Road Stoke-on-Trent Staffordshire UK ST4 6QG
2. Staffordshire University; Faculty of Health Blackheath Lane Beaconside Staffordshire UK ST18 0AD
3. University of Birmingham; School of Clinical and Experimental Medicine, College of Medical and Dental Sciences; 3rd Floor, Birmingham Women's Foundation Trust Edgbaston Birmingham UK B15 2TG