European Journal of Neurology Smith R. A., Macklin E. A., Myers K. J., Pattee G. L., Goslin K. L., Meekins G. D., Green J. R., Shefner J. M., Pioro E. P., Assessment of bulbar function in amyotrophic lateral sclerosis: validation of a self-report scale (Center for Neurologic Study Bulbar Function Scale) 25:7, p. 907 - e66 2018