The Overall Anxiety Severity and Impairment Scale as an Outcome Measure in Internet-Delivered Cognitive Behavioral Therapy for Anxiety Disorders: Observational Study by Boris Karpov, Jari Olavi Lipsanen, Ville Ritola, Tom Rosenström, Suoma Saarni, Satu Pihlaja, Jan-Henry Stenberg, Paula Laizane, Grigori Joffe

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