CAT/C/GRC/CO/7 and migrants. It is further concerned about the lack of progress on the investigation into the whereabouts of over 500 children, mostly Albanian Roma forced to beg in the streets, who had been rounded up by the police in Athens prior to the 2004 Olympic Games and had disappeared from Agia Varvara, a State-run care home. The Committee regrets to learn that, although the case was reopened twice between 2005 and 2014, it was closed both times due to lack of evidence (arts. 2 and 16). 51. The State party should: (a) Intensify its efforts to prevent and combat trafficking in human beings, including by putting in place effective procedures for the identification and referral of victims among vulnerable groups, such as asylum seekers and migrants, including unaccompanied minors; (b) Enhance efforts to investigate claims of human trafficking, including past cases of trafficking for the purposes of labour exploitation, prosecute perpetrators and ensure that victims of trafficking obtain compensation; (c) Ensure access to adequate protection and support for all victims of trafficking, especially secure shelters and counselling services. Follow-up procedure 52. The Committee requests the State party to provide, by 9 August 2020, information on follow-up to the Committee’s recommendations on non-refoulement; detention of unaccompanied migrant and asylum-seeking children; sexual and gender-based violence against refugee and asylum-seeking women and girls; and human rights defenders and humanitarian workers and volunteers (see paras. 17 (c), 23 (b), 25 (d) and 49 (a) above). In that context, the State party is invited to inform the Committee about its plans for implementing, within the coming reporting period, some or all of the remaining recommendations in the concluding observations. Other issues 53. The State party is requested to disseminate widely the report submitted to the Committee and the present concluding observations, in appropriate languages, through official websites, the media and NGOs, and to inform the Committee about its disseminating activities. 54. The Committee requests the State party to submit its next periodic report, which will be its eighth, by 9 August 2023. For that purpose, and in view of the fact that the State party has agreed to report to the Committee under the simplified reporting procedure, the Committee will, in due course, transmit to the State party a list of issues prior to reporting. The State party’s replies to that list of issues will constitute its eight periodic report under article 19 of the Convention. 12