 Apart from the Cobb angle measurement, all subjects undergo weight, height and arm span measurements, health-related quality of life HRQOL and utility measurements, and whole spine standing posteroanterior PA and lateral radiographs at each clinic visit as per routine clinic protocol. The refined Scoliosis Research Society 22-item SRS-22r questionnaire and the EuroQoL 5-Dimension 5-Level EQ5D questionnaire will thus be provided at every visit. 