The State party should strengthen existing measures to combat human trafficking in such a way as to make it possible, on the one hand, to conduct more effective checks when artistes’ visas are issued and to ensure that they are not used for unlawful purposes and, on the other, to protect the witnesses and victims of such acts. In addition, the State party should prosecute persons committing and instigating them. Next periodic report (13) The Committee invites the State party to include in its next periodic report detailed statistical data, disaggregated by offence, age, ethnic origin and sex, on complaints of acts of torture and other cruel, inhuman or degrading treatment or punishment allegedly committed by law enforcement officials as well as on investigations, prosecutions and relevant criminal and disciplinary sanctions, if relevant. The State party is also invited to include data disaggregated by age, sex and ethnic origin on: (a) The number of asylum applications registered; (b) The number of successful asylum applications; (c) The number of asylum-seekers whose applications were accepted because they had been tortured or might be tortured if returned to their country of origin; (d) The number of refoulements or expulsions. (14) The State party is encouraged to consider ratifying the Optional Protocol to the Convention against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment. (15) The State party is encouraged to disseminate widely the reports submitted by Luxembourg to the Committee, as well as the Committee’s conclusions and recommendations, in the appropriate languages, through official Internet sites, the media and non-governmental organizations. (16) The Committee invites the State party to present its core document in accordance with the requirements concerning the common core document contained in the harmonized guidelines on reporting under the international human rights treaties, adopted by the Fifth Inter-Committee Meeting of the human rights treaty bodies (HRI/MC/2006/3 and Corr.1). (17) The Committee requests the State party to provide, within one year, information on its response to the Committee’s recommendations contained in paragraphs 8, 9, 10 and 11 above. (18) The State party is invited to submit its seventh periodic report by 30 June 2011. 43. The Netherlands (1) The Committee considered the fourth periodic report of the Netherlands (CAT/C/67/Add.4) at its 763rd and 766th meetings (CAT/C/SR.763 and 766), held on 7 and 8 May 2007, and adopted on 14 May 2007, at its 774th meeting (CAT/C/SR.774), the following conclusions and recommendations. A. Introduction (2) The Committee welcomes the submission of the fourth periodic report of the Netherlands (European part of the Kingdom and Aruba) and the information presented therein. The Committee expresses its appreciation for the frank dialogue with the State party’s delegation and welcomes the extensive responses to the list of issues in written form (CAT/C/NET/Q/4/Rev.1/Add.1), including elaborate information on the implementation of the Convention in the Netherlands Antilles, which facilitated discussion between the delegation and members of the Committee. In addition, the Committee appreciates the delegation’s oral responses to questions raised and concerns expressed during the consideration of the report. 70