1. Paediatric Department, General Hospital of Edessa, Edessa, Greece
2. 2nd Orthopaedic Department, General Hospital of Thessaloniki “Papageorgiou”, Thessaloniki, Greece
3. Lancashire Cardiac Centre, Blackpool Teaching Hospitals NHS Foundation Trust, Blackpool, UK
4. Eye Department, St James’s University Hospital, The Leeds Teaching Hospital NHS Trust, Leeds, UK