A Smartphone-Based Intervention With Diaries and Therapist-Feedback to Reduce Catastrophizing and Increase Functioning in Women With Chronic Widespread Pain: Randomized Controlled Trial

Ólöf Birna Kristjánsdóttir   ^{1, 2} , RN, MSc ;   Egil A. Fors   ^{3, 4} , MD, PhD ;   Erlend Eide   ^{1, 5} ;   Arnstein Finset   ² , MApsych, PhD ;   Tonje Lauritzen Stensrud   ² , MApsych ;   Sandra van Dulmen   ^{6, 7, 8} , MApsych, PhD ;   Sigrid Hørven Wigers   ⁹ , MD, PhD ;   Hilde Eide   ^{1, 8} , RN, MApsych, PhD

¹ Institute of Nursing, Faculty of Health, Oslo and Akershus University College of Applied Sciences, Oslo, Norway

² Department of Behavioral Sciences in Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway

³ Department of Psychiatry; National Competence Centre for Complex Symptom Disorders, St Olav University Hospital, Trondheim, Norway

⁴ Department of Public Health and General Practice, Faculty of Medicine, General Practice Research Unit, Norwegian University of Science and Technology, Trondheim, Norway

⁵ edesign, Tønsberg, Norway

⁶ Netherlands Institute for Health Services Research, Utrecht, Netherlands

⁷ Department of Primary and Community Care, Radboud University Nijmegen Medical Centre, Nijmegen, Netherlands

⁸ Faculty of Health Sciences, Buskerud University College, Drammen, Norway

⁹ Jeløy Kurbad Rehabilitation Centre, Moss, Norway