125 (b) In regard to the national preventive mechanisms: (i) Advise and assist States Parties, when necessary, in their establishment; (ii) Maintain direct, and if necessary confidential, contact with the national preventive mechanisms and offer them training and technical assistance with a view to strengthening their capacities; (iii) Advise and assist them in the evaluation of the needs and the means necessary to strengthen the protection of persons deprived of their liberty against torture and other cruel, inhuman or degrading treatment or punishment; (iv) Make recommendations and observations to the States Parties with a view to strengthening the capacity and the mandate of the national preventive mechanisms for the prevention of torture and other cruel, inhuman or degrading treatment or punishment; (c) Cooperate, for the prevention of torture in general, with the relevant United Nations organs and mechanisms as well as with the international, regional and national institutions or organizations working towards the strengthening of the protection of all persons against torture and other cruel, inhuman or degrading treatment or punishment. Article 12 1. The Subcommittee on Prevention shall establish, at first by lot, a programme of regular visits to the States Parties in order to fulfil its mandate as established in article 11. 2. After consultations, the Subcommittee on Prevention shall notify the States Parties of its programme in order that they may, without delay, make the necessary practical arrangements for the visits to be conducted. 3. The visits shall be conducted by at least two members of the Subcommittee on Prevention. These members may be accompanied, if needed, by experts of demonstrated professional experience and knowledge in the fields covered by the present Protocol who shall be selected from a roster of experts prepared on the basis of proposals made by the States Parties, the Office of the United Nations High Commissioner for Human Rights and the United Nations Centre for International Crime Prevention. In preparing the roster, the States Parties concerned shall propose no more than five national experts. The State Party concerned may oppose the inclusion of a specific expert in the visit, whereupon the Subcommittee on Prevention shall propose another expert. 4. If the Subcommittee on Prevention considers it appropriate, it may propose a short followup visit after a regular visit. Article 13 1. The Subcommittee on Prevention shall establish, at first by lot, a programme of regular visits to the States Parties in order to fulfil its mandate as established in article 11. 2. After consultations, the Subcommittee on Prevention shall notify the States Parties of its programme in order that they may, without delay, make the necessary practical arrangements for the visits to be conducted.