1. Cardiff & Vale NHS Trust, University Hospital Llandough, Penlan Road, Llandough, Penarth, Vale of Glamorgan, CF64 2XX, UK.
2. University College London Hospitals, London, 235
Euston Road, London NW1 2BU, UK.
3. Hospital for Orthopaedic Surgery Lindenlohe, Lindenlohe
18, 92421 Schwandorf, Germany.
4. University College London Hospitals, 235
Euston Road, London, NW1
2BU, UK.