1 E. Thienpont, Department of Orthopaedic surgery, Cliniques Universitaires Saint Luc, Av. Hippocrate 10, 1200 Brussels, Belgium.
2 G. Quaglio, Policy analyst, Panel for Future Science and Technology (STOA), Directorate-General for Parliamentary Research Services (EPRS), European Parliament, Brussels, Belgium.
3 T. Karapiperis, Head of Unit, Panel for Future Science and Technology (STOA), Directorate-General for Parliamentary Research Services (EPRS), European Parliament, Brussels, Belgium.
4 P. Kjaersgaard-Andersen, Associate professor, Department of Orthopaedics, Vejle Hospital, South Danish University, Vejle, Denmark.