The top 10 research priorities in psoriatic arthritis: a James Lind Alliance Priority Setting Partnership by Hailey, L, Bundy, C, Burstow, H, Chandler, D, Cowper, R, Helliwell, P, Joannes, L, Kelly, A, Kennedy, B, Kinsella, S, McAteer, H, Mukherjee, S, Packham, J, Wise, E, Young, H, Coates, LC