1.Dickens, C, Katon, W, Blakemore, A, et al. Does depression predict the use of urgent and unscheduled care by people with long term conditions? A systematic review with meta-analysis. J Psychosom Res 2012; 73: 334–42.
2.Nunes, BP, Flores, TR, Mielke, GI, Thumé, E, Facchini, LA. Multimorbidity and mortality in older adults: a systematic review and meta-analysis. Arch Gerontol Geriatr 2016; 67: 130–8.
3.Mujica-Mota, RE, Roberts, M, Abel, G, et al. Common patterns of morbidity and multi-morbidity and their impact on health-related quality of life: evidence from a national survey. Qual Life Res 2015; 24: 909–18.
4.Thorpe, KE, Ogden, LL, Galactionova, K. Chronic conditions account for rise in Medicare spending from 1987 to 2006. Health Aff (Millwood) 2010; 29: 718–24.
5.Archer, J, Bower, P, Gilbody, S, et al. Collaborative care for depression and anxiety problems. Cochrane Database Syst Rev 2012; 10: CD006525.
6.Coventry, PA, Lovell, K, Dickens, C, et al. Collaborative Interventions for Circulation and Depression (COINCIDE): study protocol for a cluster randomized controlled trial of collaborative care for depression in people with diabetes and/or coronary heart disease. Trials 2012; 13: 139.
7.Panagioti, M, Bower, P, Kontopantelis, E, et al. Association between chronic physical conditions and the effectiveness of collaborative care for depression. JAMA Psychiatry 2016; 73: 978.
9.Coventry, P, Lovell, K, Dickens, C, et al. Integrated primary care for patients with mental and physical multimorbidity: cluster randomised controlled trial of collaborative care for patients with depression comorbid with diabetes or cardiovascular disease. BMJ 2015; 350: h638.
10.Coventry, PA, Lovell, K, Dickens, C, et al. Update on the collaborative interventions for circulation and depression (COINCIDE) trial: changes to planned methodology of a cluster randomized controlled trial of collaborative care for depression in people with diabetes and/or coronary heart disease. Trials 2013; 14: 136.
11.Brown, S, Thorpe, H, Hawkins, K, Brown, J. Minimization – reducing predictability for multi-centre trials whilst retaining balance within centre. Stat Med 2005; 24: 3715–27.
12.Kroenke, K, Spitzer, RL, Williams, JBW. The PHQ-9. J Gen Intern Med 2001; 16: 606–13.
13.National Institute of Health and Care Excellence (NICE). Depression in Adults With a Chronic Physical Health Problem: Recognition and Management [CG91]. NICE, 2009 (https://www.nice.org.uk/guidance/CG91).
14.Derogatis, LR, Cleary, PA. Confirmation of the dimensional structure of the SCL-90: a study in construct validation. J Clin Psychol 1977; 33: 981–9.
15Herdman, M, Gudex, C, Lloyd, A, Janssen, MF, Kind, P, Parkin, D, et al. Development and preliminary testing of the new five-level version of EQ-5D (EQ-5D-5L). Quality of life research 2011; 20(10): 1727–36.
19.Devlin, N, Shah, K, Feng, Y, Mulhern, B, Van Hout, B. Valuing Health-Related Quality of Life: An EQ-5D-5L Value Set for England. Office of Health Economics, 2016 (https://www.ohe.org/publications/valuing-health-related-quality-life-eq-5d-5l-value-set-england).
20.van Hout, B, Janssen, MF, Feng, Y-S, et al. Interim scoring for the EQ-5D-5L: mapping the EQ-5D-5L to EQ-5D-3L value sets. Value Heal 2012; 15: 708–15.
21Skevington, SM, Lotfy, M, O'Connell, KA. The World Health Organization's WHOQOLBREF quality of life assessment: psychometric properties and results of the international field trial. A report from the WHOQOL group. Qual Life Res 2004; 13: 299–310.
22Spitzer, RL, Kroenke, K, Williams, JW, Löwe, B. A brief measure for assessing generalized anxiety disorder: the GAD-7. Arch Intern Med 2006; 166: 1092–97.
23Lorig, K, Stewart, A, Ritter, P, Gonzalez, V, Laurent, D, Lynch, J. Outcome measures for health education and other health care interventions. Sage, 1996.
24Osborne, RH, Elsworth, GR, Whitfeld, K. The health education impact questionnaire (heiQ): an outcomes and evaluation measure for patient education and self-management interventions for people with chronic conditions. Patient Educ Couns 2007; 66: 192–201.
25Sheehan, DV, Harnett-Sheehan, K, Raj, BA. The measurement of disability. Int Clin Psychopharmacol 1996; 11(suppl 3): 89–95.
26.Gwirtsman, H, Blehar, M, McCullough, J, Kocsis, J, Prien, R. Standardized assessment of dysthymia. Psychopharmacol Bull 1997; 33: 1–5.
27.Green, C, Richards, DA, Hill, JJ, et al. Cost-effectiveness of collaborative care for depression in UK primary care: economic evaluation of a randomised controlled trial (CADET). PLoS One 2014; 9: e104225.
28.Camacho, EM, Ntais, D, Coventry, P, et al. Long-term cost-effectiveness of collaborative care (v. usual care) for people with depression and comorbid diabetes or cardiovascular disease: a Markov model informed by the COINCIDE randomised controlled trial. BMJ Open 2016; 6: e012514.
29.Barnett, K, Mercer, SW, Norbury, M, Watt, G, Wyke, S, Guthrie, B. Epidemiology of multimorbidity and implications for health care, research, and medical education: a cross-sectional study. Lancet 2012; 380: 37–43.
30.Petrou, S, Murray, L, Cooper, P, Davidson, LL. The accuracy of self-reported healthcare resource utilization in health economic studies. Int J Technol Assess Health Care 2002; 18: 705–10.
31.Bhandari, A, Wagner, T. Self-reported utilization of health care services: improving measurement and accuracy. Med Care Res Rev 2006; 63: 217–35.
32.Richards, DA, Hill, JJ, Gask, L, et al. Clinical effectiveness of collaborative care for depression in UK primary care (CADET): cluster randomised controlled trial. BMJ 2013; 347: f4913.