Development and evaluation by a cluster randomised trial of a psychosocial intervention in children and teenagers experiencing diabetes: the DEPICTED study oleh JW Gregory, M Robling, K Bennert, S Channon, D Cohen, E Crowne, H Hambly, K Hawthorne, K Hood, M Longo, L Lowes, R McNamara, T Pickles, R Playle, S Rollnick, E Thomas-Jones