How could users be retained on the site for longer periods of time ? Methods of the Study The online survey is the main design of the study as it is internet based of course . The sample population consisted of 19 607 online visitors as `free range users ' who registered on the site between April 2001 and September 2003 . The control group is the 182 participants in the MoodGYM condition of the BlueMood trial . To assess the symptoms of depression of...











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