Eames, N., Baker, R., Hill, N., Graham, K., Taylor, T., & Cosgrove, A. (1999). The effect of botulinum toxin A on gastrocnemius length : magnitude and duration of response. Developmental Medicine and Child Neurology, 41(4), 226-232. https://doi.org/10.1111/j.1469-8749.1999.tb00589.x