Coalition for Health and Gender Equity (CHANGE)—a protocol for a global cross-sectional survey of health and gender equity in rheumatology by Khursheed, T, Ovseiko, P, Dyball, S, Nakashima, R, Gonzalez, AMA, Babini, A, Kalla, AA, Hill, C, Danda, D, Dey, D, Traboco, L, Nikiphorou, E, Harifi, G, Badshah, H, Hmamouchi, I, Marie Von Feldt, J, Farani, JB, Andreoli, L, Guimarães, MP, Toro Gutiérrez, CE, Sieiro Santos, C, Duftner, C, Alpizar Rodriguez, D, Ziadé, N, Coates, L