Table 1 Key topics explored in the child, parent and health professional interviews

Children and parent interviews

 • Experience of illness

 • Initial thoughts about CONTRACT

 • Experience of being approached about CONTRACT

 - Thoughts on how CONTRACT was explained

 - How the health professional explained the treatment options

 - Family preferences

 - Recollection of key aspects of CONTRACT

 • Decision-making about CONTRACT participation/non-participation

 • Views and understanding of randomisation

 • Experience of treatment

 • Experience of recovery

 • Reflections on CONTRACT since being approached

Health professional interviews

 • Initial thoughts about CONTRACT

 • Knowledge of CONTRACT and views on its aims

 • Recruitment pathways

 • Experiences of approaching families

 • Health professional treatment preferences

 • Experience of delivering the treatments

 • Anticipated CONTRACT results