The study will be conducted using a randomized controlled trial with a between-group design. Participants will be randomized to two groups, were one group will gain access to iCBT treatment while the second group will be a wait-list control, and will gain access to the program once treatment of the active group is finished. Participants will assessed by a licensed psychologist, and treatment modules assigned based on their individual needs. In addition to online CBT modules, consisting of information, exercises and homework assignments, all participants will have regular contact by secure email-channel with a licensed psychologist or last-year psychology student under supervision. This contact will guide treatment, providing support, feedback on homework, and if necessary clarify treatment content and help with IT-related problems interfering with treatment adherence. After a year, participants will be invited to take part in a follow-up module, consisting of limited treatment recapitulation and evaluation.