Erik Andersson

Erik Andersson is a clinical psychologist and PhD  at Karolinska Institutet in Stockholm, Sweden. Erik works at an OCD clinic at the Karolinska University Hospital – Huddinge and also as a lecturer at the psychologist program. Erik´s main focus is on how to enhance psychological treatment on OCD and related disorders. Erik also does health economical evaluations of CBT trials.

Publication list (n=40):

In press:

• Andersson E, Ljotsson B, Hedman E, Hesser H, Enander J, Kaldo V, Andersson G, Lindefors N, Rück C. (in press) Testing the mediating effects of obsessive beliefs in Internet-based cognitive behaviour therapy for obsessive-compulsive disorder: Results from a randomized controlled trial. Clinical Psychology & Psychotherapy
• Kemani M, Olsson G, Lekander M, Hesser H, Andersson E, Wicksell R (in press) Efficacy and cost-effectiveness of Acceptance and Commitment Therapy and Applied Relaxation for longstanding pain: A randomized controlled trial. Clinical Journal of Pain
• Hedman E, Axelsson E, Görling A, Ritzman C, Ronnheden M, El Alaoui S, Andersson E, Lekander M, Ljótsson B. Exposure based cognitive behaviour therapy and behavioural stress management delivered via the internet for severe health anxiety:randomised controlled trial. Br J Psychiatry In Press.
• Hedman E, Ljótsson B, Andersson E, Andersson G, Lindefors N, Rück C, Axelsson E, Lekander M. Psychometric properties of internet-administered measures of health anxiety: An investigation of the health anxiety inventory, the illness attitude scales and the whiteley index. J Anxiety Disord In Press.

2015:

• Andersson, E., Hedman, E., Ljótsson, B., Wikström, M., Elveling, E., Lindefors, N., Andersson, G., Kaldo, V., & Rück, C. (2015). Cost-effectiveness of internet-based cognitive behavior therapy for obsessive-compulsive disorder: Results from a randomized controlled trial. Journal of Obsessive-Compulsive and Related Disorders, 4, 47-53.
• Andersson, E., Ljótsson, B., Hedman, E., Enander, J., Kaldo, V., Andersson, G., Lindefors, N., & Rück, C. (2015). Predictors and moderators of Internet-based cognitive behavior therapy for obsessive-compulsive disorder: Results from a randomized trial. Journal of Obsessive-Compulsive and Related Disorders, 4, 1-7.
• Andersson, E., Ljótsson, B., Hedman, E., Mattson, S., Enander, J., Andersson, G., Kaldo, V., Lindefors, N., & Rück, C. (2015). Cost-effectiveness of an internet-based booster program for patients with obsessive-compulsive disorder: Results from a randomized controlled trial. Journal of Obsessive-Compulsive and Related Disorders, 1, 14-19.
• Hedman E, Andersson E, Lekander M, Ljótsson B. (2015) Predictors in internet-delivered cognitive behavior therapy and behavioral stress management for severe health anxiety. Behav Res Ther 64:49-55
• Hedman E, Lekander M, Ljótsson B, Lindefors N, Rück C, Andersson G, Andersson E. (2015) Optimal Cut-Off Points on the Health Anxiety Inventory, Illness Attitude Scales and Whiteley Index to Identify Severe Health Anxiety. PLoS ONE 10(4):e0123412. doi:10.1371/journal.pone.0123412

2014:

• Andersson, E., Steneby, S., Karlsson, K., Ljótsson, B., Hedman, E., Enander, J., Kaldo, V., Andersson, G., Lindefors, N., Rück, C. (2014) Long-term efficacy of Internet-based cognitive behavior therapy for obsessive-compulsive disorder with or without booster: A randomized controlled trial. Psychological medicine 44(13):2877-87
• Enander J, Ivanov VZ, Andersson E,et al. Therapist-guided, Internet-based cognitive–behavioural therapy for body dysmorphic disorder (BDD-NET): a feasibility study. BMJOpen 2014;4
• Lenhard F, Vigerland S, Andersson E, Rück C, Mataix-Cols D, et al. (2014) Internet-Delivered Cognitive Behavior Therapy for Adolescents with Obsessive-Compulsive Disorder: An Open Trial. PLoS ONE 9(6): e100773.
• Ljótsson B, Atterlöf E, Lagerlöf M, Andersson E, Jernelöv S, Hedman E, Kemani M, Wicksell RK. (2014) Internet-Delivered Acceptance and Values-Based Exposure Treatment for Fibromyalgia: a Pilot Study. Cognitive Behaviour Therapy, 43(2).
• Ljótsson B, Hesser H, Andersson E, Lackner JM, El Alaoui S, Falk L, Aspvall K, Fransson J, Hammarlund K, Löfström A, Nowinski S, Lindfors P & Hedman E. (2014) Provoking symptoms to relieve symptoms: A randomized controlled dismantling study of exposure therapy in irritable bowel syndrome. Behaviour Research and Therapy. 55, 27-39
• Hedman, E., El Alaoui, S., Lindefors, N., Andersson, E., Rück, C., Ghaderi, A., Kaldo, V., Lekander, M., Andersson, G., & Ljótsson, B. (2014). Clinical effectiveness and cost-effectiveness of Internet- vs. group-based cognitive behavior therapy for social anxiety disorder: 4-year follow-up of a randomized trial. Behaviour Research and Therapy, 59C, 20-29.
• Hedman, E., Lekander, M., Ljótsson, B., Lindefors, N., Rück, C., Hofmann, S. G., Andersson, E., et al. (2014). Sudden gains in internet-based cognitive behaviour therapy for severe health anxiety. Behaviour research and therapy, 54(C), 22–29.
• Hedman E, Andersson G, Lindefors N, Gustavsson P, Lekander M, Rück C, Andersson E, Ljótsson B. Personality change following internet-based cognitive behavior therapy for severe health anxiety PLoS ONE 1;9(12):e113871

2013:

• Hedman, E., Andersson, E., Andersson, G., Lindefors, N., Lekander, M., Rück, C., & Ljótsson, B. (2013). Mediators in Internet-Based Cognitive Behavior Therapy for Severe Health Anxiety. PLoS ONE, 8(10)
• Hedman, E. , Andersson, E., Lindefors, N., Andersson, G., Rück, C., & Ljótsson, B. (in press) Cost-effectiveness and long-term effectiveness of Internet-based cognitive behaviour therapy for severe health anxiety. Psychological Medicine.
• Hedman, E., Lindefors, N., Andersson, G., Andersson, E., Lekander, M., Rück, C., & Ljótsson, B. (2013). Predictors of outcome in Internet-based cognitive behavior therapy for severe health anxiety. Behaviour research and therapy, 51(10), 711–717.
• Hedman, E., Ljótsson, B., Rück, C., Bergström, J., Andersson, G., Kaldo, V., Jansson, L., et al. (2013). Effectiveness of Internet-based cognitive behaviour therapy for panic disorder in routine psychiatric care. Acta psychiatrica Scandinavica,
• Hedman, E., Mörtberg, E., Hesser, H., Clark, D. M., Lekander, M., Andersson, E., & Ljótsson, B. (2013). Mediators in psychological treatment of social anxiety disorder: Individual cognitive therapy compared to cognitive behavioral group therapy. Behaviour research and therapy, 51(10), 696–705.
• Ljótsson B, Hesser H, Andersson E, Lindfors P, Hursti T, Rück C, Lindefors N, Andersson G, Hedman E. (2013) Mechanisms of Change in an Exposure-Based Treatment for Irritable Bowel Syndrome. Journal of Consulting and Clinical Psychology. 81(6), 1113-1126.
• Ljótsson, B., Andersson, E., Lindfors, P., Lackner, J. M., Grönberg, K., Molin, K., Norén, J., et al. (2013). Prediction of symptomatic improvement after exposure-based treatment for irritable bowel syndrome BMC gastroenterology, 13(1), 160.

2012:

• Andersson, E., Enander, J., Andrén, P., Hedman, E., Ljótsson, B., Hursti, T., Bergström, J., et al. (2012). Internet-based cognitive behaviour therapy for obsessive-compulsive disorder: a randomizedcontrolled trial Psychological medicine, 1–11.
• Andersson, E, Rück, C. (2012). Internet-based cognitive behaviour therapy for obsessive-compulsive disorder: Implications. Psicoterapia Cognitiva e Comportamentale – Monograph Supplement (pp. 13-22)
• Enander, J., Andersson, E., Kaldo, V., Lindefors, N., Andersson, G., & Rück, C. (2012). Internet administration of the Dimensional Obsessive-Compulsive Scale: a psychometric evaluation. Journal of Obsessive-Compulsive and Related Disorders, 1, 325-330.
• Hedman, E., Andersson, E., Lindefors, N., Andersson, G., Rück, C., & Ljótsson, B. (2012). Cost-effectiveness and long-term effectiveness of Internet-based cognitive behaviour therapy for severe health anxiety Psychological medicine, 1–12.
• Hedman, E., Andersson, E., Ljótsson, B., Andersson, G., Andersson, E., Schalling, M., Lindefors, N., et al. (2012). Clinical and genetic outcome determinants of Internet- and group-based cognitive behavior therapy for social anxiety disorder. Acta psychiatrica Scandinavica, Predictors and moderators of CBT for SAD 1, no–no. doi:10.1111/j.1600-0447.2012.01834.x

2011:

• Andersson, E., Ljótsson, B., Hedman, E., Kaldo, V., Paxling, B., Andersson, G., Lindefors, N., & Rück, C. (2011a). Internet-based cognitive behavior therapy for obsessive compulsive disorder: a pilot study BMC Psychiatry, 11, 125.
• Andersson, E., Ljótsson, B., Smit, F., Paxling, B., Hedman, E., Lindefors, N., Andersson, G., & Rück, C. (2011b). Cost-effectiveness of internet-based cognitive behavior therapy for irritable bowel syndrome: results from a randomized controlled trial BMC public health, 11, 215.
• Andersson, E., Walén, C., Hallberg, J., Paxling, B., Dahlin, M., Almlöv, J., Källström, R., Wijma, K., et al. (2011c). A randomized controlled trial of guided Internet-delivered cognitive behavioral therapy for erectile dysfunction The journal of sexual medicine, 8(10),
• Hedman, E., Andersson, E., Ljótsson, B., Andersson, G., Rück, C., & Lindefors, N. (2011a). Cost-effectiveness of Internet-based cognitive behavior therapy vs. cognitive behavioral group therapy for social anxiety disorder: results from a randomized controlled trial Behaviour research and therapy, 49(11), 729–736.
• Hedman, E., Andersson, G., Andersson, E., Ljótsson, B., Rück, C., Asmundson, G. J. G., & Lindefors, N. (2011b). Internet-based cognitive-behavioural therapy for severe health anxiety: randomised controlled trial The British journal of psychiatry : the journal of mental science, 198(3), 230–236.
• Hedman, E., Andersson, G., Ljótsson, B., Andersson, E., Rück, C., Mörtberg, E., & Lindefors, N. (2011c). Internet-basedcognitive behavior therapy vs. cognitive behavioral group therapy for social anxiety disorder: a randomized controlled non-inferiority trial PLoS ONE, 6(3).
• Ljótsson, B., Andersson, G., Andersson, E., Hedman, E., Lindfors, P., Andréewitch, S., Rück, C., & Lindefors, N. (2011a). Acceptability, effectiveness, and cost-effectiveness of internet-based exposure treatment for irritable bowel syndrome in a clinical sample: a randomized controlled trial BMC gastroenterology, 11, 110.
• Ljótsson, B., Hedman, E., Andersson, E., Hesser, H., Lindfors, P., Hursti, T., Rydh, S., Rück, C., et al. (2011b). Internet-delivered exposure-based treatment vs. stress management for irritable bowel syndrome: a randomized trial The American journal of gastroenterology, 106(8), 1481–1491.
• Rück, C., Andersson, E., Andréewitch, S., Bejerot, S., Ivarsson, T., Bates, S., & Lindefors, N. (2011). [Again and again–the obsessive circle can be broken] Läkartidningen, 108(14), 798–801.

2010:

• Bergström, J., Andersson, G., Ljótsson, B., Rück, C., Andréewitch, S., Karlsson, A., Carlbring, P., et al. (2010). Internet-versus group-administered cognitive behaviour therapy for panic disorder in a psychiatric setting: a randomised trial BMC Psychiatry, 10, 54–10. doi:10.1186/1471-244X-10-54
• Hedman, E., Ljótsson, B., Andersson, E., Rück, C., Andersson, G., & Lindefors, N. (2010). Effectiveness and cost offset analysis of group CBT for hypochondriasis delivered in a psychiatric setting: an open trial Cognitive behaviour therapy, 39(4), 239–250.