1Castell, BD, Kazantzis, N, Moss-Morris, RE. Cognitive behavioral therapy and graded exercise for chronic fatigue syndrome: a meta-analysis. Clin Psychol Sci Prac 2011; 18: 311–24.
2Malouff, JM, Thorsteinsson, EB, Rooke, SE, Bhullar, N, Schutte, NS. Efficacy of cognitive behavioral therapy for chronic fatigue syndrome: a meta-analysis. Clin Psychol Rev 2008; 28: 736–45.
3Price, JR, Mitchell, E, Tidy, E, Hunot, V. Cognitive behaviour therapy for chronic fatigue syndrome in adults. Cochrane Database Syst Rev 2008; 3: CD001027.
4Wiborg, JF, van Bussel, J, van Dijk, A, Bleijenberg, G, Knoop, H. Randomised controlled trial of cognitive behaviour therapy delivered in groups of patients with chronic fatigue syndrome. Psychother Psychosom 2015; 84: 368–76.
5Hedman, E, Ljotsson, B, Lindefors, N. Cognitive behavior therapy via the Internet: a systematic review of applications, clinical efficacy and cost-effectiveness. Expert Rev Pharmacoecon Outcomes Res 2012; 12: 745–64.
6Nijhof, SL, Bleijenberg, G, Uiterwaal, CS, Kimpen, JL, van de Putte, EM. Effectiveness of internet-based cognitive behavioural treatment for adolescents with chronic fatigue syndrome (FITNET): a randomised controlled trial. Lancet 2012; 379: 1412–8.
7Andreassen, HK, Bujnowska-Fedak, MM, Chronaki, CE, Dumitru, RC, Pudule, I, Santana, S, et al. European citizens’ use of E-health services: a study of seven countries. BMC Public Health 2007; 7: 53.
8Spek, V, Cuijpers, P, Nyklicek, I, Riper, H, Keyzer, J, Pop, V. Internet-based cognitive behaviour therapy for symptoms of depression and anxiety: a meta-analysis. Psychol Med 2007; 37: 319–28.
9Janse, A, Worm-Smeitink, M, Bussel-Lagarde, J, Bleijenberg, G, Nikolaus, S, Knoop, H. Testing the efficacy of web-based cognitive behavioural therapy for adult patients with chronic fatigue syndrome (CBIT): study protocol for a randomized controlled trial. BMC Neurol 2015; 15: 137.
11Fukuda, K, Straus, SE, Hickie, I, Sharpe, MC, Dobbins, JG, Komaroff, A. The chronic fatigue syndrome: a comprehensive approach to its definition and study. International chronic fatigue syndrome study group. Ann Intern Med 1994; 121: 953–9.
12Reeves, WC, Lloyd, A, Vernon, SD, Klimas, N, Jason, LA, Bleijenberg, G, et al. Identification of ambiguities in the 1994 chronic fatigue syndrome research case definition and recommendations for resolution. BMC Health Serv Res 2003; 3: 25.
13Lecrubier, Y, Sheehan, DV, Weiller, E, Amorim, P, Bonora, I, Sheehan, K, et al. The Mini International Neuropsychiatric Interview (MINI). A short diagnostic structured interview: reliability and validity according to the CIDI. Eur Psychiatry 1997; 5: 224–31.
14Vercoulen, JH, Swanink, CM, Fennis, JF, Galama, JM, van der Meer, JW, Bleijenberg, G. Dimensional assessment of chronic fatigue syndrome. J Psychosom Res 1994; 38: 383–92.
15Dittner, AJ, Wessely, SC, Brown, RG. The assessment of fatigue: a practical guide for clinicians and researchers. J Psychosom Res 2004; 56: 157–70.
16Bergner, M, Bobbitt, RA, Carter, WB, Gilson, BS. The Sickness Impact Profile: development and final revision of a health status measure. Med Care 1981; 19: 787–805.
17Knoop, H, Bleijenberg, G. Het Chronisch Vermoeidheidssyndroom. Behandelprotocol Cognitieve Gedragstherapie voor CVS. [Chronic Fatigue Syndrome. Treatment Protocol for Cognitive Behavioural Therapy with CFS Patients.] Bohn Stafleu Van Loghum, 2010.
18Knoop, H, Bleijenberg, G, Gielissen, MF, van der Meer, JW, White, PD. Is a full recovery possible after cognitive behavioural therapy for chronic fatigue syndrome? Psychother Psychosom 2007; 76: 171–6.
19Stewart, A, Hays, R, Ware, J. The MOS short-form general health survey. Reliability and validity in a patient population. Med Care 1988; 26: 724–35.
20Derogatis, LR. SCL-90-R: Administration, Scoring and Procedures Manual (3rd edn). NCS Pearson, 1994.
21Arrindell, W, Ettema, J. SCL-90, Handleiding bij een Multidimensionele Psychopathologie-Indicator. [SCL-90 Manual in How to Use a Muli-Dimensional Psychopathology Indicator.] Swets & Zeitlinger BV, 1986.
22van Der Schaaf, ME, Schmits, IC, Roerink, M, Geurts, DE, Toni, I, Roelofs, K, et al. Investigating neural mechanisms of change of cognitive behavioural therapy for chronic fatigue syndrome: a randomized controlled trial. BMC Psychiatry 2015; 15: 144.
23Jacobson, NS, Truax, P. Clinical significance: a statistical approach to defining meaningful change in psychotherapy research. J Consult Clin Psychol 1991; 59: 12–9.
24Chalder, T, Berelowitz, G, Pawlikowska, T, et al. Development of a fatigue scale. J Psychosom Res 1993; 37: 147–53.
25Mundt, JC, Marks, IM, Shear, MK et al. The Work and Social Adjustment Scale: a simple measure of impairment in functioning. Br J Psychiatry 2002; 180: 461–4.
26Worm-Smeitink, M, Nikolaus, S, Goldsmith, K, Wiborg, J, Ali, S, Knoop, H, et al. Cognitive behaviour therapy for chronic fatigue syndrome: differences in treatment outcome between a tertiary treatment centre in the United Kingdom and the Netherlands. J Psychosom Res 2016; 87: 43–9.
27Hoeymans, N, van Lindert, H, Westert, GP. The health status of the Dutch population as assessed by the EQ-6D. Qual Life Res 2005; 14: 655–63.
28Knoop, H, van der Meer, JW, Bleijenberg, G. Guided self-instructions for people with chronic fatigue syndrome: randomised controlled trial. Br J Psychiatry 2008; 193: 340–1.
29Borm, GF, Fransen, J, Lemmens, WA. A simple sample size formula for analysis of covariance in randomized clinical trials. J Clin Epidemiol 2007; 60: 1234–8.
30Beck, AT, Guth, D, Steer, RA, Ball, R. Screening for major depression disorders in medical inpatients with the Beck Depression Inventory for Primary Care. Behav Res Ther 1997; 35: 785–91.
31Andrews, G, Cuijpers, P, Craske, MG, McEvoy, P, Titov, N. Computer therapy for the anxiety and depressive disorders is effective, acceptable and practical health care: a meta-analysis. PLoS One 2010; 5: e13196.
32White, PD, Goldsmith, K, Johnson, AL, Chalder, T, Sharpe, M. Recovery from chronic fatigue syndrome after treatments given in the PACE trial. Psychol Med 2013; 43: 2227–35.
33Heins, MJ, Knoop, H, Prins, JB, Stulemeijer, M, van der Meer, JW, Bleijenberg, G. Possible detrimental effects of cognitive behaviour therapy for chronic fatigue syndrome. Psychother Psychosom 2010; 79: 249–56.
34White, PD, Goldsmith, KA, Johnson, AL, Potts, L, Walwyn, R, DeCesare, JC, et al. Comparison of adaptive pacing therapy, cognitive behaviour therapy, graded exercise therapy, and specialist medical care for chronic fatigue syndrome (PACE): a randomised trial. Lancet 2011; 377: 823–36.
35Cho, HJ, Hotopf, M, Wessely, S. The placebo response in the treatment of chronic fatigue syndrome: a systematic review and meta-analysis. Psychosom Med 2005; 67: 301–13.
36Wiborg, JF, Knoop, H, Stulemeijer, M, Prins, JB, Bleijenberg, G. How does cognitive behaviour therapy reduce fatigue in patients with chronic fatigue syndrome? The role of physical activity. Psychol Med 2010; 40: 1281–7.
37Tummers, M, Knoop, H, Bleijenberg, G. Effectiveness of stepped care for chronic fatigue syndrome: randomized noninferiority trial. J Consult Clin Psychol 2010; 78: 724–31.