1. Department of Obstetrics and Gynecology; Santa Maria Hospital; Faculty of Medicine of Lisbon University; Lisbon Portugal
2. Department of Obstetrics and Gynecology; Medical School; University of Porto; S. João Hospital; Institute of Biomedical Engineering; Porto Portugal
3. Department of Medical Informatics; Medical School; University of Porto; Porto Portugal
4. Center for Maternal Cardiac Care; TriHealth, Good Samaritan Hospital; Cincinnati OH USA
5. Department of Obstetrics & Gynecology; St George's Hospital; University of London; London UK