Mills, P., Vakil, A., Phillips, C., Kei, L., & Kwon, B. (2018). Intra-rater and inter-rater reliability of the Penn Spasm Frequency Scale in People with chronic traumatic spinal cord injury. Spinal Cord. https://doi.org/10.1038/s41393-018-0063-5 (Original work published 2018)