CRC/C/15/Add.201 page 11 (c) Ensure that issuance of preliminary orders by courts is used as a temporary measure and that the best interests of the child remain a primary consideration; (d) Ensure that children under 15 years of age are not placed in the same institutions as juvenile delinquents, in conformity with the principles and provisions of the Convention; (e) Take all necessary measures to improve conditions in institutions, in accordance with article 3 of the Convention, and increase the participation of children; (f) workers; Provide support and training for personnel in institutions, including social (g) Provide adequate follow-up and reintegration support and services for children leaving institutional care. 6. Basic health and welfare 46. The Committee is encouraged by the decline in the infant mortality rate. However, the Committee is deeply concerned that the present economic situation in the health sector does not allow for compulsory preventive medical check-ups of children, from birth to the age of 3, to be covered by public health insurance. Furthermore, the Committee regrets the insufficient information provided following the Committee’s previous recommendation (CRC/C/15/Add.81, para. 38) to undertake research on the possible effects of environmental pollution on the health of children. 47. The Committee recommends that the State party urgently: (a) Define sustainable financing mechanisms for the primary health-care system and an effective utilization of resources, including adequate salaries for child health-care professionals, in order to ensure that all children, in particular children from the most marginalized vulnerable groups, have access to free basic health care of good quality; (b) Undertake comprehensive research on the possible effects of environmental pollution on the health of children with a view to effectively addressing this problem. Children with disabilities 48. The Committee welcomes information on the national plan to equalize opportunities for citizens with medical disabilities and is encouraged by the growing number of children with disabilities who are integrated into mainstream education; however, the Committee is concerned that: (a) The previous recommendation of the Committee (ibid., para. 37) has been insufficiently addressed and that institutionalization of children with disabilities remains high. The Committee notes the concern expressed by the Committee on Economic, Social and Cultural Rights at the inadequacy of measures to ensure a decent life for persons with disabilities, including the mentally ill (E/C.12/1/Add.76, para. 20);