1. From the Peripheral Neuropathy Unit, Hammersmith Hospital, Imperial College London (AA, YY, PA), Department of Uro-Neurology, National Hospital for Neurology and Neurosurgery, University College London Hospital (AA, RP, PD, CJF), and Department of Urology, Guy’s and St. Thomas’ Hospitals (PD), London, the Neurology and Gastrointestinal Centre of Excellence for Drug Discovery, GlaxoSmithKline, Harlow (JBD), United Kingdom, and the Neurobiology Unit, Roche Palo Alto, Palo Alto, California (DC, APDWF)