1. Hospital for General Pediatrics and Neonatology, Saarland University Medical Center, Homburg, Germany
2. Prenatal Medicine Dorsten, Dorsten, Germany
3. Practice for Gynecology and Women Health, LARA, Bocholt, Germany
4. Fetal Cardiology, Heart and Diabetes Center NRW, Ruhr University Bochum, Bad Oeynhausen, Germany
5. Prenatal Medical Center Münster, Münster, Germany