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4 SAFETY BEHAVIOR INCREASES OBSESSION-RELATED COGNITIONS ABOUT THE SEVERITY OF THREAT Sophie van Uijen Marieke Toffolo Behavior Therapy, 2015, 46, 521-531 Author contributions: both authors contributed equally to this work. SvU conceptualized the research idea. SvU and MT designed the experiment and developed study materials. SvU supervised the data collection. MT extracted the data. SvU analyzed the data. MT drafted the introduction and method. SvU drafted the results and discussion. SvU and MT revised the manuscript.