1. Department of Paediatric Surgery and Paediatric Orthopaedic Surgery, University of Turku and Turku University Hospital, Savitehtaankatu 5, 20520 Turku, Finland
2. Department of Surgery, Vaasa Central Hospital, Wellbeing Services County of Ostrobothnia, 65130 Vaasa, Finland
3. Department of Orthopaedics and Traumatology, University of Helsinki and Helsinki University Hospital, 00029 Helsinki, Finland
4. Department of Paediatric Orthopaedic Surgery, Helsinki New Children’s Hospital, 00290 Helsinki, Finland
5. Department of Anaesthesiology and Intensive Care, Turku University Hospital and University of Turku, 20521 Turku, Finland