1. Department of Obstetrics, Vivantes Medical Center Berlin-Neukoelln, Berlin, Germany
2. Department of Obstetrics and Gynecology, St. Joseph Hospital, Berlin, Germany
3. German Heart Institute, Berlin, Germany
4. Department of Obstetrics and Gynecology, Harbor UCLA Medical Center, Torrance, California
5. Department of Obstetrics, Humboldt University, Charité, Berlin, Germany
6. Department of Biochemistry and Molecular Biology, Universidad San Pablo-CEU, Madrid, Spain