[1] Newcastle Univ, Inst Cellular Med, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[2] Newcastle Univ, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[3] Newcastle & North Tyneside NHS Trust, Dept Hlth Psychol, Newcastle Upon Tyne, Tyne & Wear, England
[4] Great Ormond St Hosp Sick Children, Dept Psychosocial Serv, London, England
[5] Great Ormond St Hosp Sick Children, London, England
[6] UCL, Inst Child Hlth, London, England
[7] Royal Victoria Infirm, Dept Paediat Immunol & Infect Dis, Newcastle Upon Tyne NE1 4LP, Tyne & Wear, England