1Giacco, D, Palumbo, C, Strappelli, N, Catapano, F, Priebe, S. Social contacts and loneliness in people with psychotic and mood disorders. Compr Psychiatry 2016; 66: 59–66.
2Harley, EW, Boardman, J, Craig, T. Friendship in people with schizophrenia: a survey. Soc Psychiatry Psychiatr Epidemiol 2012; 47: 1291–9.
3Giacco, D, McCabe, R, Kallert, T, Hansson, L, Fiorillo, A, Priebe, S. Friends and symptom dimensions in patients with psychosis: a pooled analysis. PloS One 2012; 7: e50119.
4Becker, T, Leese, M, Clarkson, P, Taylor, R, Turner, D, Kleckham, J, et al. Links between social networks and quality of life: an epidemiologically representative study of psychotic patients in South London. Soc Psychiatry Psychiatr Epidemiol 1998; 33: 299–304.
5Eklund, M, Hansson, L. Social network among people with persistent mental illness: associations with sociodemographic, clinical and health-related factors. Int J Soc Psychiatry 2007; 53: 293–305.
6Worswick, E, Dimic, S, Wildgrube, C, Priebe, S. Negative symptoms and avoidance of social interaction: a study of non-verbal behaviour. Psychopathology 2018; 51: 1–9.
7Hansen, CF, Torgalsboen, AK, Melle, I, Bell, MD. Passive/apathetic social withdrawal and active social avoidance in schizophrenia: difference in underlying psychological processes. J Nerv Ment Dis 2009; 197: 274–7.
8Angermeyer, MC, Dietrich, S. Public beliefs about and attitudes towards people with mental illness: a review of population studies. Acta Psychiatr Scand 2006; 113: 163–79.
9Toner, S, Fabisch, K, Priebe, S, Klug, G. Attitudes towards severe mental illness and social distance: a survey of volunteer befrienders in Austria. Int J Soc Psychiatry 2018; 64: 470–5.
10Hallett, C, Klug, G, Lauber, C, Priebe, S. Volunteering in the care of people with severe mental illness: a systematic review. BMC Psychiatry 2012; 12: 226.
11Toner, S, Hickling, L, Pinto da Costa, M, Cassidy, M, Priebe, S. Characteristics, motivations and experiences of volunteer befrienders for people with mental illness: a systematic review and narrative synthesis. BMC Psychiatry 2018; 18: 378.
12Priebe, S, Omer, S, Giacco, D, Slade, M. Resource-oriented therapeutic models in psychiatry: conceptual review. Br J Psychiatry 2014; 204: 256–61.
13Thompson, R, Valenti, E, Siette, J, Priebe, S. To befriend or to be a friend: a systematic review of the meaning and practice of “befriending” in mental health care. J Ment Health 2016; 25: 71–7.
14Mead, N, Lester, H, Chew-Graham, C, Gask, L, Bower, P. Effects of befriending on depressive symptoms and distress: systematic review and meta-analysis. Br J Psychiatry 2010; 196: 96–101.
15Siette, J, Cassidy, M, Priebe, S. Effectiveness of befriending interventions: a systematic review and meta-analysis. BMJ Open 2017; 7: e014304.
16McCorkle, BH, Rogers, ES, Dunn, EC, Lyass, A, Wan, YM. Increasing social support for individuals with serious mental illness: evaluating the compeer model of intentional friendship. Community Ment Health J 2008; 44: 359–66.
17Sheridan, AJ, Drennan, J, Coughlan, B, O'Keeffe, D, Frazer, K, Kemple, M, et al. Improving social functioning and reducing social isolation and loneliness among people with enduring mental illness: Report of a randomised controlled trial of supported socialisation. Int J Soc Psychiatry 2015; 61: 241–50.
18Priebe, S, Pavlickova, H, Eldridge, S, Golden, E, McCrone, P, Ockenden, N, et al. Effectiveness of one-to-one volunteer support for patients with psychosis: protocol of a randomised controlled trial. BMJ Open 2016; 6: e011582.
19World Health Organization. The ICD-10 Classification of Mental and Behavioural Disorders: Clinical Descriptions and Diagnostic Guidelines. WHO, 1992.
20Hodgekins, J, French, P, Birchwood, M, et al. Comparing time use in individuals at different stages of psychosis and a non-clinical comparison group. Schizophr Res 2015; 161: 188–93.
21Kay, S, Flszbein, A, Opfer, L. Positive and negative scale for schizophrenia. Schizophr Bull 1987; 13: 463–8.
22Kring, AM, Gur, RE, Blanchard, JJ, Horan, WP, Reise, SP. The clinical assessment interview for negative symptoms (CAINS): final development and validation. Am J Psychiatry 2013; 170: 165–72.
23Beck, AT, Steer, RA, Brown, GK. Beck Depression Inventory-II. Psychological Corporation 1996.
24Priebe, S, Huxley, P, Knight, S, Evans, S. Application and results of the Manchester Short Assessment of Quality of Life (MANSA). Int J Soc Psychiatry 1999; 45: 7–12.
25Priebe, S, Watzke, S, Hansson, L, Burns, T. Objective Social Outcomes Index (SIX): a method to summarise objective indicators of social outcomes in mental health care. Acta Psychiatr Scand 2008; 118: 57–63.
26Lecomte, T, Corbière, M, Laisné, F. Investigating self-esteem in individuals with schizophrenia: relevance of the Self-Esteem Rating Scale-Short Form. Psychiatry Res 2006; 143: 99–108.
27Dunn, G, Maracy, M, Dowrick, C, et al. Estimating psychological treatment effects from a randomised controlled trial with both non-compliance and loss to follow-up. Br J Psychiatry 2003; 183: 323–31.
28Fowler, D, Hodgekins, J, French, P, Marshall, M, Freemantal, N, McCrone, P, et al. Social recovery therapy in combination with early intervention services for enhancement of social recovery in patients with first-episode psychosis (SUPEREDEN3): a single-blind, randomised controlled trial. Lancet Psychiatry 2018; 5: 41–50.
29Szymczynska, P, Walsh, S, Greenberg, L, Priebe, S. Attrition in trials evaluating complex interventions for schizophrenia: systematic review and meta-analysis. J Psychiatr Res 2017; 90: 67–77.
30Toner, S, Cassidy, M, Chevalier, A, Farreny, A, Leverton, M, da Costa, MP, et al. Preferences for befriending schemes: a survey of patients with severe mental illness. BMC Psychiatry 2018; 18: 64.
31Klug, G, Toner, S, Fabisch, K, Priebe, S. Characteristics and motivations of volunteers providing one-to-one support for people with mental illness: a survey in Austria. Soc Psychiatry Psychiatr Epidemiol 2018; 53: 841–7.