Investigating genotype–phenotype relationship of extreme neuropathic pain disorders in a UK national cohort by Themistocleous, AC, Baskozos, G, Blesneac, I, Comini, M, Megy, K, Chong, S, Deevi, SVV, Ginsberg, L, Gosal, D, Hadden, RDM, Horvath, R, Mahdi-Rogers, M, Manzur, A, Mapeta, R, Marshall, A, Matthews, E, McCarthy, MI, Reilly, MM, Renton, T, Rice, ASC, Vale, TA, van Zuydam, N, Walker, SM, Woods, CG, Bennett, DLH