1. Department of Development and Regeneration, KU Leuven, Leuven, Belgium
2. Department of Biomedical Data Sciences, Leiden University Medical Center (LUMC), Leiden, The Netherlands
3. Department of Obstetrics and Gynaecology, University Hospitals Leuven, Leuven, Belgium
4. Centre for Statistics in Medicine, Nuffield, Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, UK
5. Oxford University Hospitals NHS Foundation Trust, Oxford, UK