institutions and interviewing persons deprived of their liberty. 27. The two standing subgroups of the CPT, the Medical Group and the Jurisprudence Group, have continued to meet on the Sunday before each plenary meeting. The Medical Group examines substantive issues of a medical nature related to the CPT’s mandate and organises training sessions on the specifc tasks that medical members of visiting delegations are required to perform. The task of the Jurisprudence Group is to advise the CPT on innovations and possible inconsistencies in the Committee’s standards as refected in visit reports and to identify areas where there is room for development of those standards. 28. Ad hoc working groups can also be established to examine specifc topics, and one such group was tasked with reviewing the CPT’s existing standards regarding juveniles deprived of their liberty. The document prepared by this group formed the basis of the substantive section contained in this General Report (see paragraphs 96 to 132). Another ad hoc group working on the monitoring of the deportation of foreign nationals by air (return fights) has pursued its work, and a delegation of the CPT took part in a return fight (see paragraph 18). Contacts with other bodies 29. On 17 December 2013 and 2 December 2014, the CPT’s President attended the informal meetings of the Presidents of Council of Europe monitoring bodies organised by the Secretary General with the aim of ensuring a better co-ordination of the activities of the diferent monitoring mechanisms operating within the Council of Europe. In November 2014, the CPT’s President also had exchanges of views with two intergovernmental bodies of the Council of Europe – the European Committee for Social Cohesion, Human Dignity and Equality and the Steering Committee for Human Rights. Reference has already been made to the CPT’s broad-ranging exchange of views with judges of the European Court of Human Rights in March 2014. Further, as in previous years, regular contacts have been maintained with the Council of Europe Commissioner for Human Rights and members of his Ofce on matters of common interest. 30. CPT members have taken part in a number of activities organised within the framework of the Council of Europe. Reference might be made in this context to the participation of the CPT’s President at a high-level conference on the implementation of the Council of Europe Strategy for the Rights of the Child (20122015) held in Dubrovnik in March 2014 and at a conference on immigration detention in Europe held in Strasbourg in November 2013, as well as to the participation of the CPT’s 1st and 2nd VicePresidents at, respectively, an expert meeting on prison health care in Europe organised in Strasbourg in May 2014 and the 19th Conference of Directors of Prison and Probation Services held in Helsinki in June 2014. Further, a member of the CPT has been taking part in the preparation of an Additional Protocol to the Oviedo Convention, addressing the protection of human rights and dignity of persons with mental disorders in the context of involuntary treatment and placement. 31. The CPT has also continued to seize opportunities for promoting synergy with bodies outside the Council of Europe. This includes regular contacts during visits with feld missions of the European Union, the International Committee of Activities during the period 1 August 2013 to 31 December 2014 ► Page 15