Gender equity in academic rheumatology, current status and potential for improvement: a cross-sectional study to inform an EULAR task force by Ovseiko, PV, Gossec, L, Andreoli, L, Kiltz, U, van Mens, L, Hassan, N, van der Leeden, M, Siddle, HJ, Alunno, A, McInnes, IB, Damjanov, NS, Apparailly, F, Ospelt, C, van der Horst-Bruinsma, IE, Nikiphorou, E, Druce, KL, Szekanecz, Z, Sepriano, A, Avcin, T, Bertsias, G, Schett, G, Keenan, A-M, Pololi, LH, Coates, LC