1. Department of Mechanical Engineering Faculty of Engineering of the University of Porto Porto Portugal
2. Division of Biomechanics INEGI – Institute of Science and Innovation in Mechanical and Industrial Engineering Porto Portugal
3. Division of Obstetrics University Hospital of Zurich Zurich Switzerland
4. Department of Gynecology and Obstetrics, Centro Hospitalar de São João ‐ EPE Faculty of Medicine of the University of Porto Porto Portugal