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Robertson, Kelvin, Laurence A. G. Marshman, Maria Hennessy, Linton Harriss, and David Plummer. "Pregabalin Versus Gabapentin in the Treatment of Sciatica: Study Protocol for a Randomised, Double-blind, Cross-over Trial (PAGPROS)." Trials 2018.

Robertson, Kelvin, et al. "Pregabalin Versus Gabapentin in the Treatment of Sciatica: Study Protocol for a Randomised, Double-blind, Cross-over Trial (PAGPROS)." Trials 2018.