specialized care provided in hospitals and their dependent specialty centers will focus care on complex health problems. Hospital centers will develop, besides their functions strictly related to health care, functions of health promotion, prevention of illnesses and investigation and teaching, in accord with the programs of each area of health, with the object of complementing their activities with those developed by the primary care network. As elsewhere in the world, the size of hospitals in Spain is often gauged by the number of "installed beds" (camas instaladas). This is the number of hospital beds with fixed locations; at any given time, some beds may be out of commission. General and specialized hospitals General hospitals treat a broad range of pathologies and typically provide services including surgery, obstetrics and gynecology, and pediatrics. Other hospitals are more specialized. The following list includes most of the common types of specialized hospitals in Spain, but is not intended to be exhaustive. Surgical hospitals Medical-surgical hospitals Maternity hospitals Children's hospitals Maternity and Children's hospitals (materno-infantil) Psychiatric hospitals Hospitals for illnesses of the thorax Oncological hospitals Ophthalmic hospitals Traumatological and rehabilitation hospitals Psycho-physical rehabilitation hospitals Geriatric and longterm care hospitals Leprological and dermatological hospitals Health care contracts Spanish government-run healthcare administrations sign health care contracts (conciertos sanitarios) with privately run entities that provide health care services. They are regulated by the provisions of the General Health Law and the current rules of government contracting. There are some special cases where the relation between the hospital and the managing entity is regulated by a special arrangement called a Convenio de Vinculación or Convenio Singular ("Linkage Convention" or "Singluar Convention"). In Catalonia there are also centers integrated into the Network of Hospitals for Public Use (Red de Hospitales de Utilización Pública, XHUP) as outlined in the supplement to Decree 124/2008 of the Department of Health of the Autonomous Government of Catalonia (Anexo del Decreto 124/2008 del Departamento de Salud de la Generalitat de Catalunya). Patrimonial dependency The patrimonial dependency (dependencia patrimonial) of a hospital (or other health care facility) is the individual or other juridical entity that owns, at least, the building occupied by the facility. Hospitals that are under the dependency of Spanish Social Security belong primarily to the General Treasury of Social Security, although there is a special group within Social Security for the Mutuals of Accidents and Occupational Diseases (Mutuas de Accidentes de Trabajo y