Are there randomized controlled trial studies on Effectiveness of Online CBT for Anxiety Disorders, Obsessive-Compulsive Disorders, and Pathological Gambling?
There are many RCT on CBT and PG, but I am unsure of any studies on online CBT, anxiety, OCD and PG. I would recommend sending an email through the Gambling Issues International listserv and asking that question. It is a great way of getting rapid responses from researchers around the world on different topics. I am pasting the link for the listserv, but if you have difficulty, let me know and I will direct you to the person who can add your name to the list.
I also forgot to mention a website that may be useful for you to know. It is www.problemgambling.ca. It has a lot of information and tools for individuals with gambling problems, as well as their families, but it also has information for professionals (research, treatment recommendations, courses for professionals, etc.).
Anderson and colleagues published a series of studies (pilot, randomized controlled trial and long-term efficacy) on an online CBT for OCD. I believe two of the papers were published in Psychological Medicine. If you search internet-based cbt for ocd you should find them.