1Fink, P, Ornbol, E, Christensen, KS. The outcome of health anxiety in primary care. A two-year follow-up study on health care costs and self-rated health. PLoS One 2010; 5: e9873.
2Tyrer, P, Cooper, S, Crawford, M, Dupont, S, Green, J, Murphy, D, et al. Prevalence of health anxiety problems in medical clinics. J Psychosom Res 2011; 71: 392–4.
3Fink, P, Ornbol, E, Toft, T, Sparle, KC, Frostholm, L, Olesen, F. A new, empirically established hypochondriasis diagnosis. Am J Psychiatry 2004; 161: 1680–91.
4Sunderland, M, Newby, JM, Andrews, G. Health anxiety in Australia: prevalence, comorbidity, disability and service use. Br J Psychiatry 2013; 202: 56–61.
5American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders (5th edn) (DSM-5). American Psychiatric Association, 2013.
6Cooper, K, Gregory, JD, Walker, I, Lambe, S, Salkovskis, PM. Cognitive behaviour therapy for health anxiety: a systematic review and meta-analysis. Behav Cogn Psychother 2017; 45: 110–23.
7Perreault, M, Lafortune, D, Laverdure, A, Chartier-Otis, M, Belanger, C, Marchand, A, et al. Barriers to treatment access reported by people with anxiety disorders. Can J Psychiatry 2013; 58: 300–5.
8Marques, L, LeBlanc, NJ, Weingarden, HM, Timpano, KR, Jenike, M, Wilhelm, S. Barriers to treatment and service utilization in an internet sample of individuals with obsessive-compulsive symptoms. Depress Anxiety 2010; 27: 470–5.
9Rusch, N, Angermeyer, MC, Corrigan, PW. Mental illness stigma: concepts, consequences, and initiatives to reduce stigma. Eur Psychiatry 2005; 20: 529–39.
10Soucy, JN, Hadjistavropoulos, HD. Treatment acceptability and preferences for managing severe health anxiety: perceptions of internet-delivered cognitive behaviour therapy among primary care patients. J Behav Ther Exp Psychiatry 2017; 57: 14–24.
11Kohn, R, Saxena, S, Levav, I, Saraceno, B. The treatment gap in mental health care. Bull World Health Organ 2004; 82: 858–66.
12Tyrer, P, Eilenberg, T, Fink, P, Hedman, E, Tyrer, H. Health anxiety: the silent, disabling epidemic. BMJ 2016; 353: i2250.
13Pichlhofer, O, Maier, M. Unregulated access to health-care services is associated with overutilization–lessons from Austria. Eur J Public Health 2015; 25: 401–3.
14Hoffmann, D, Rask, CU, Hedman-Lagerlof, E, Ljótsson, B, Frostholm, L. Development and feasibility testing of internet-delivered acceptance and commitment therapy for severe health anxiety: pilot study. JMIR Ment Health 2018; 5: e28.
15Andrews, G, Basu, A, Cuijpers, P, Craske, MG, McEvoy, P, English, CL, et al. Computer therapy for the anxiety and depression disorders is effective, acceptable and practical health care: an updated meta-analysis. J Anxiety Disord 2018; 55: 70–8.
16Andersson, G, Titov, N. Advantages and limitations of internet-based interventions for common mental disorders. World Psychiatry 2014; 13: 4–11.
17Kim, EH, Linker, DT, Coumar, A, Dean, LS, Matsen, FA, Kim, Y. Factors affecting acceptance of a web-based self-referral system. IEEE Trans Inf Technol Biomed 2011; 15: 344–7.
18Brown, JS, Boardman, J, Whittinger, N, Ashworth, M. Can a self-referral system help improve access to psychological treatments? Br J Gen Pract 2010; 60: 365–71.
19Eilenberg, T, Fink, P, Jensen, JS, Rief, W, Frostholm, L. Acceptance and commitment group therapy (ACT-G) for health anxiety: a randomized controlled trial. Psychol Med 2016; 46: 103–15.
20World Health Organization. SCAN: Schedules for Clinical Assessment in Neuropsychiatry (Version 2.1 edn). World Health Organization, Division of Mental Health, 1998.
21Dantoft, TM, Ebstrup, JF, Linneberg, A, Skovbjerg, S, Madsen, AL, Mehlsen, J, et al. Cohort description: the Danish study of Functional Disorders. Clin Epidemiol 2017; 9: 127–39.
22Mohr, DC, Burns, MN, Schueller, SM, Clarke, G, Klinkman, M. Behavioral intervention technologies: evidence review and recommendations for future research in mental health. Gen Hosp Psychiatry 2013; 35: 332–8.
23Hajebi, A, Motevalian, A, Amin-Esmaeili, M, Hefazi, M, Radgoodarzi, R, Rahimi-Movaghar, A, et al. Telephone versus face-to-face administration of the Structured Clinical Interview for Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, for diagnosis of psychotic disorders. Compr Psychiatry 2012; 53: 579–83.
24Fink, P, Ewald, H, Jensen, J, Sorensen, L, Engberg, M, Holm, M, et al. Screening for somatization and hypochondriasis in primary care and neurological in-patients: a seven-item scale for hypochondriasis and somatization. J Psychosom Res 1999; 46: 261–73.
25American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders (DSM-IV-TR) 4th ed. text rev. APA, 2000.
26World Health Organization, Collaborating Centres for Classification of Diseases. ICD-10: International Statistical Classification of Diseases and Related Health Problems. WHO, 2014.
27Olsen, LR, Mortensen, EL, Bech, P, Elsass, P, Ivanouw, J, Poulsen, S, et al. Symptom Checklist (SCL-90, SCL-90-R og SCL-92. In Assessmentmetoder. Håndbog for psykologer og psykiatere [Assessment Methods. Handbook for Psychologists and Psychiatrists] (1st edn) (eds Olsen, LR, Mortensen, EL, Bech, P, Elsass, P, Ivanouw, J., Poulsen, S, et al. ): 183. Dansk Psykologisk Forlag, 2006.
28Fink, P, Ornbol, E, Huyse, FJ, De Jonge, P, Lobo, A, Herzog, T, et al. A brief diagnostic screening instrument for mental disturbances in general medical wards. J Psychosom Res 2004; 57: 17–24.
29Fink, P, Orbol, E, Hansen, MS, Sondergaard, L, De Jonge, P. Detecting mental disorders in general hospitals by the SCL-8 scale. J Psychosom Res 2004; 56: 371–5.
30Derogatis, LR, Cleary, PA. Confirmation of the dimensional structure of the SCL-90: a study in construct validation. J Clin Psychol 1977; 33: 981–9.
31Kim, SW, Dysken, MW, Kuskowski, M. The symptom checklist-90: obsessive-compulsive subscale: a reliability and validity study. Psychiatry Res 1992; 41: 37–44.
32Bjorner, JB, Damsgaard, MT, Watt, T, Groenvold, M. Tests of data quality, scaling assumptions, and reliability of the Danish SF-36. J Clin Epidemiol 1998; 51: 1001–11.
33Ware, JE Jr. SF-36 Health Survey Update. In The Use of Psychological Testing for Treatment Planning and Outcome Assessment (3rd edn) (ed Maruish, ME): 693–718. Lawrence Erlbaum Associates Publishers, 2004.
34Christensen, LN, Ehlers, L, Larsen, FB, Jensen, MB. Validation of the 12 item short form health survey in a sample from region central Jutland. Soc Indic Res 2013; 114: 513–21.
35Bond, FW, Hayes, SC, Baer, RA, Carpenter, KM, Guenole, N, Orcutt, HK, et al. Preliminary psychometric properties of the Acceptance and Action Questionnaire–II: a revised measure of psychological inflexibility and experiential avoidance. Behav Therapy 2011; 42: 676–88.
36Hayes, SC, Strosahl, K, Wilson, KG, Bissett, RT, Pistorello, J, Toarmino, D, et al. Measuring experiential avoidance: a preliminary test of a working model. Psychol Rec 2004; 54: 553–78.
37Baer, RA, Smith, GT, Lykins, E, Button, D, Krietemeyer, J, Sauer, S, et al. Construct validity of the five facet mindfulness questionnaire in meditating and nonmeditating samples. Assessment 2008; 15: 329–42.
38Eilenberg, T, Hoffmann, D, Jensen, JS, Frostholm, L. Intervening variables in group-based acceptance & commitment therapy for severe health anxiety. Behav Res Ther 2017; 92: 24–31.
39Hedman, E, Hesser, H, Andersson, E, Axelsson, E, Ljotsson, B. The mediating effect of mindful non-reactivity in exposure-based cognitive behavior therapy for severe health anxiety. J Anxiety Disord 2017; 50: 15–22.
40Newby, JM, Smith, J, Uppal, S, Mason, E, Mahoney, AEJ, Andrews, G. Internet-based cognitive behavioral therapy versus psychoeducation control for illness anxiety disorder and somatic symptom disorder: a randomized controlled trial. J Consult Clin Psychol 2018; 86: 89–98.
41Titov, N, Andrews, G, Kemp, A, Robinson, E. Characteristics of adults with anxiety or depression treated at an internet clinic: comparison with a national survey and an outpatient clinic. PLoS One 2010; 5: e10885.
42Spence, J, Titov, N, Solley, K, Dear, BF, Johnston, L, Wootton, B, et al. Characteristics and treatment preferences of people with symptoms of posttraumatic stress disorder: an internet survey. PLoS One 2011; 6: e21864.
43Wootton, BM, Titov, N, Dear, BF, Spence, J, Kemp, A. The acceptability of internet-based treatment and characteristics of an adult sample with obsessive compulsive disorder: an internet survey. PLoS One 2011; 6: e20548.
44Muse, K, McManus, F, Leung, C, Meghreblian, B, Williams, JM. Cyberchondriasis: fact or fiction? A preliminary examination of the relationship between health anxiety and searching for health information on the Internet. J Anxiety Disord 2012; 26: 189–96.
45Bo, A, Friis, K, Osborne, RH, Maindal, HT. National indicators of health literacy: ability to understand health information and to engage actively with healthcare providers - a population-based survey among Danish adults. BMC Public Health 2014; 14: 1095.
46Clark, DM. Realizing the mass public benefit of evidence-based psychological therapies: the IAPT program. Annu Rev Clin Psychol 2018; 14: 159–83.
47Holmes, EA, Ghaderi, A, Harmer, CJ, Ramchandani, PG, Cuijpers, P, Morrison, AP, et al. The Lancet Psychiatry Commission on psychological treatments research in tomorrow's science. Lancet Psychiatry 2018; 5: 237–86.