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3 DISCONFIRMING CONTAMINATION-RELATED THREAT BELIEFS BY EXPOSURE PLUS SAFETY BEHAVIOR Sophie van Uijen Marcel van den Hout Anne Klein Schiphorst Emma Knol Iris Engelhard Journal of Behavior Therapy and Experimental Psychiatry, 2017, 55 , 25-32. Author contributions: SvU conceptualized the research idea. SvU, AKS, and EK designed the experiment and developed study materials. AKS and EK collected the data. SvU analyzed the data and drafted the manuscript. SvU, MvdH, and IE revised the manuscript.