Vanicek, N, Coleman, E, Watson, J, Bell, K, McDaid, C, Barnett, C, Twiste, M, Jepson, F, Salawu, A, Harrison, D, Mitchell, N, "STEPFORWARD study : a randomised controlled feasibility trial of a self-aligning prosthetic ankle-foot for older patients with vascular-related amputations", BMJ Open, 2021