A/HRC/7/8 page 9 have been allegations of killings for ritual purposes. Although formal reports of organ and tissue trafficking were few, diverse unconfirmed rumours persisted. Therefore, there was a need to report and investigate when these allegations appear and to ensure criminal sanctions against the traffickers and all those involved as child abusers. The Special Rapporteur invited all countries to establish legislation and standards so as to clearly regulate transplantation of organs and tissues and reminded Governments of the different safeguards put in place by different international and regional mechanisms, in order to avoid the development of “transplant tourism”. 26. Concerning abducted and disappeared children, the Special Rapporteur invited all member States to set up a coordinated, comprehensive, and global approach where different State institutions as well as NGOs and private business would be involved, and he gave examples of States that have already elaborated legislative and administrative measures and programmes to tackle this issue. These rapid-response programmes are not only tools to respond to the problem of abducted and missing children, but they also allow for considerable improvement among the different organizations for prevention of violence against children. The Special Rapporteur encouraged all countries to develop their own systems of quick response for the search of disappeared or abducted children, using unified protocols for police intervention, the help of civil society and a wide range of public awareness campaigns. As good practices, the Special Rapporteur pointed out the activities of the National Centre for Missing and Exploited Children of United States, and similar networks in Europe. IV. ASSISTANCE AND REHABILITATION PROGRAMMES FOR CHILD VICTIMS OF TRAFFICKING AND SEXUAL COMMERCIAL EXPLOITATION 27. Minors who are victims can be exposed to severe violence, rapes, compulsory prostitution, forced labour and other forms of abuses and exploitation. Each victim, without exception, requires urgent and adequate help for overcoming the consequences of psychological and physical trauma. 28. The purpose of this report therefore is to provide comprehensive guidelines for the establishment and management of rehabilitation and assistance programmes for minors who are victims of sexual commercial exploitation and trafficking, taking into account examples provided by Member States and positive initiatives developed by civil society and international organizations in specific regions and countries. 29. Rehabilitation and assistance programmes may take many forms such as shelters, medical and psychological assistance and may depend on many factors, such as availability of funding, security concerns, availability of services, capacity and demand for these programmes and facilities, etc. The shelters may house few or many persons, they may be in temporary locations, and they may be situated in a variety of locations: houses, apartments, hotels, rooms in special facilities (such as hospitals), churches. Shelters may be specialized for trafficked persons only or may house other persons in need of similar assistance, such as victims of other crimes (e.g., domestic violence). The word “shelter” is used to refer to a wider group of facilities providing accommodation and assistance to victims of trafficking, such as medical rehabilitation centres, transit shelters and halfway houses, unless otherwise specified.