A/HRC/39/20 Mechanism on the Rights of Indigenous Peoples with national human rights institutions. The latter were also invited to submit information for a study by the Expert Mechanism on free, prior and informed consent, to be submitted to the Human Rights Council at its thirtyninth session. At its annual session in July 2018, the Expert Mechanism held an interactive dialogue with national human rights institutions. B. United Nations treaty bodies 62. OHCHR continued to support the engagement of national human rights institutions with United Nations treaty bodies. OHCHR, as the secretariat of the treaty bodies, and the Geneva representative of the Global Alliance of National Human Rights Institutions liaised with national human rights institutions of States under review to encourage them to provide written or oral information and/or to attend the sessions of treaty bodies. The OHCHR National Institutions, Regional Mechanisms and Civil Society Section continued to prepare briefing notes on national human rights institutions for the attention of treaty bodies and to disseminate relevant recommendations and concluding observations of treaty bodies to the national institutions. 63. During the reporting period, the treaty bodies reviewed 132 States parties, of which 89 had national human rights institutions. Of these institutions, 57 submitted information and 43 provided briefings to treaty bodies (see annex III). 64. In comparison with the previous reporting period, there was an increase of 5 per cent in the submission of information to treaty bodies and of 14 per cent in the number of national human rights institutions providing briefings to them. 65. Treaty bodies continued to provide national human rights institutions with information notes, advice and tools to facilitate their effective engagement and have invited their representatives to their meetings. 66. At its sixty-ninth session, the Committee on the Elimination of Discrimination against Women decided to establish a working group consisting of its members and national human rights institutions with a view to enhancing their interaction in a more structured manner. 67. In March 2018, OHCHR, the Global Alliance of National Human Rights Institutions and the International Disability Alliance organized the first interactive annual debate with independent monitoring frameworks and national human rights institutions. The debate focused on national human rights institutions sharing best practices in monitoring article 19 of the Convention on the Rights of Persons with Disabilities and on the participation of persons with disabilities in monitoring activities at the national level. The discussion resulted in the adoption of a joint declaration to establish a follow-up group, comprised of national human rights institutions and other independent monitoring frameworks, to develop a common framework to monitor the implementation of article 19. C. Other United Nations mechanisms and processes 68. In December 2017, the Open-ended Working Group on Ageing invited national human rights institutions to attend and contribute to its ninth session, in July 2018. 69. In March 2018, national human rights institutions participated in the sixty-second session of the Commission on the Status of Women, which, in its agreed conclusions, encouraged its secretariat to continue considering how to enhance the participation of national human rights institutions fully compliant with the Paris Principles, in accordance with the rules of procedure of the Economic and Social Council. 70. In June 2018, national human rights institutions were accredited to the Conference of States Parties to the Convention on the Rights of Persons with Disabilities. The Global Alliance of National Human Rights Institutions delivered a statement at the Conference and hosted a side event, in cooperation with the Committee on the Rights of Persons with Disabilities, the International Disability Alliance and UNDP. 11