A/HRC/28/31 21. The European Commission against Racism and Intolerance contributed, with its expertise, to the work of the Committee on the Elimination of Racial Discrimination on hate speech and on the role of anti-discrimination bodies. 22. Experts of the Committee on the Rights of the Child, IACHR Rapporteur on the Rights of the Child, the Special Representative on violence against children, representatives of OHCHR, the United Nations Development Programme (UNDP) and the United Nations International Children and Education Fund (UNICEF) participated in a meeting in Panama, from 6 to 19 May 2013, to strategize about joint actions. They also held a public event to promote the ratification of regional and international treaties relating to the rights of the child. 23. The Council of Europe has promoted the signature and ratification of the Optional Protocol to the Convention on the Rights of the Child on a communications procedure. Reference to the United Nations standards on child rights and the general comments of the Committee on the Rights of the Child were included in the Council of Europe Strategy on the Rights of the Child (2012-2015). In turn, the Committee on the Rights of the Child, in its concluding observations, referred to Council of Europe instruments and underlined the added value of the child rights standards set by the Council of Europe. 24. The African Committee on the Rights and Welfare of the Child participated in the meeting of the Committee on the Rights of the Child, in May 2013. 25. Treaty bodies reported that they took the recommendations of regional human rights mechanisms into consideration in their reviews. The secretariats of the treaty bodies liaise with regional human rights mechanisms regarding individual complaints in order to ensure that the same complaints are not dealt with at the same time by other mechanisms and to safeguard jurisprudential coherence. 26. It was suggested that in view of the substantial body of jurisprudence developed by the judicial organs of regional human rights mechanisms, especially the African Court on Human and Peoples’ Rights, cooperation between treaty bodies and regional mechanisms should be further enhanced for mutual benefit. C. Universal periodic review 27. In 2008, when the Universal Periodic Review (UPR) was established, the High Commissioner addressed letters to regional organizations inviting them to submit information to the process for the stakeholders report. OHCHR sent communications to regional organizations before every UPR session, inviting them to submit information for inclusion in the stakeholders’ report prepared by OHCHR. 28. The Council of Europe submitted information on its member States that were being reviewed through the desk-to-desk cooperation between OHCHR and the Council of Europe. IACHR submitted input for the UPR of Chile, Costa Rica, Dominica, the Dominican Republic, Nicaragua and Uruguay, in 2013, and for Bolivia (Plurinational State of), El Salvador, the United States of America, Jamaica, Panama and Honduras, in 2014. III. Thematic discussions 29. In accordance with Human Rights Council resolution 24/19, the second session of the workshop was devoted to discussions about economic, social and cultural rights. The first panel focused on strengthening cooperation between international and regional human rights systems to mainstream economic, social and cultural rights, while the second panel 7