Open-label randomised pragmatic trial (CONTACT) comparing naproxen and low-dose colchicine for the treatment of gout flares in primary care por Roddy, E, Clarkson, K, Blagojevic-Bucknall, M, Mehta, R, Oppong, R, Avery, A, Hay, EM, Heneghan, C, Hartshorne, L, Hooper, J, Hughes, G, Jowett, S, Lewis, M, Little, P, McCartney, K, Mahtani, KR, Nunan, D, Santer, M, Williams, S, Mallen, CD