1. Department of Obstetrics, Cliniques Universitaires Saint-Luc, Brussels, Belgium;
2. Department of Obstetrics, Clinique Edith Cavell, Brussels, Belgium;
3. Department of Pneumology, Clinique Edith Cavell, Brussels, Belgium;
4. Department of Thoracic Surgery, University Hospitals Leuven, Leuven, Belgium;
5. Department of Gynecology Oncology, University Hospitals Leuven, Leuven, Belgium