*Author for correspondence:

E-mail Address: matthew.wilcox.13@ucl.ac.uk

Peripheral Nerve Injury Research Unit, Royal National Orthopaedic Hospital, London, HA7 4LP, UK

University College London Centre for Nerve Engineering, London, WC1E 6BT, UK

Department of Pharmacology, University College London, School of Pharmacy, London, WC1N 1AX, UK