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If you use the sPSQI instrument in your research, please cite the following paper:
Famodu, O. A., Barr, M. L., Holásková, I., Zhou, W., Morrell, J. S., Colby, S. E., and Olfert, M. (2018). Shortening of the Pittsburgh sleep quality index survey using factor analysis. Sleep Disorders, Article ID 9643937.
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