1. Johann Wolfgang Goethe University Frankfurt, Frankfurt am Main, Germany
2. School of Electrical and Electronic Engineering, University of Nottingham, Nottingham, United Kingdom
3. Obstetrics and Gynaecology, Teaching Hospital of the Ruhr-University Bochum, Witten, Germany
4. Department of Biostatistics and Mathematical Models, Johann Wolfgang Goethe-University Frankfurt, Frankfurt am Main, Germany
5. Obstetrics and Gynaecology Department, Johann Wolfgang Goethe University Frankfurt, Frankfurt am Main, Germany