1. Fetal Medicine Centre; Birmingham Women's NHS Foundation Trust; Birmingham UK
2. Birmingham Centre for Women's and New-born Health, College of Medical and Dental Sciences; University of Birmingham; Birmingham UK
3. Institute of Metabolism and Systems Research, College of Medical and Dental Sciences; University of Birmingham; Birmingham UK
4. Institute of Applied Health Research, College of Medical and Dental Sciences; University of Birmingham; Birmingham UK
5. The Ethox Centre, Nuffield Department of Population Health; University of Oxford; Oxford UK
6. West Midlands Regional Genetics Laboratory; Birmingham Women's NHS Foundation Trust; Birmingham UK
7. Wellcome Trust Sanger Institute; Cambridge UK