Recognizing that, despite the progress made, challenges to preventing and combating trafficking in women and girls and to protecting and assisting the victims of human trafficking remain and that further efforts should be made to a dopt and implement adequate legislation and other measures and to continue improving the collection of reliable data disaggregated by sex, age, nationality, disability, geographic location and other characteristics relevant in national contexts and other relevant factors and of statistics that would allow proper analysis of the nature, extent and risk factors of trafficking in women and girls,