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              Meyer TJ, Miller ML, Metzger RL, Borkovec TD. Development and validation of the penn state worry questionnaire. Behav Res Ther. 1990;28(6):487-95.
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              Meyer, T. J., Miller, M. L., Metzger, R. L., & Borkovec, T. D. (1990). Development and validation of the Penn State Worry Questionnaire. Behaviour Research and Therapy, 28(6), 487- 495. https://doi.org/10.1016/0005-7967(90)90135 -6
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              Meyer, T. J., Miller, M. L., Metzger, R. L., & Borkovec, T. D. (1990). Development and validation of the penn state worry question- naire. Behaviour Research and Therapy, 28(6), 487-495.
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              Meyer, T. J., Miller, M. L., Metzger, R. L., Borkovec, T. D. (1990). Development and validation of the penn state worry question- naire. Behaviour Research and Therapy, 28(6), pp. 487-495.
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