Some terms used are consultorios rurales, consultorios locales, and consultorios periféricos (respectively, rural, local and "peripheral"; that last means a center located in a community other than the main settlement of a municipality), but other terms may exist, analogous to those that refer to various types of health centers. According to the 2008 National Catalog of Hospitals (Catálogo Nacional de Hospitales 2008), Spain in 2007 had a total of 10,178 consultorios that allowed health professionals to provide more local services than the health centers in their respective zones, with the purpose of bringing basic services closer to people who reside in nuclei dispersed through rural areas that tend to have an older than average population. Health centers A health center (centro de salud, distinct from the smaller "healthcare center" centro sanitario) in Spain's SNS is main physical and functional structure devoted to coordinated global, integral, permanent and continuing primary care, based in a team of health care professionals and other professionals who work there as a team. Health centers basically practice the general medicine or family medicine, providing a unity of care in which a specialist in community and family medicine is responsible to provide preventive care, health promotion, diagnosis and basic treatment on an outpatient basis. According to the 2008 National Catalog of Hospitals (Catálogo Nacional de Hospitales), in 2007 Spain had 2,913 health centers. Specialized centers Specialized centers are healthcare centers where different health care professionals provide services to particular group identified by common pathologies, age, or other common characteristics. Among these are: Dental clinics Focused on care of the teeth and mouth. Centers for assisted human reproduction Biomedical teams focused on assisted reproductive technology. Centers for voluntary interruption of pregnancy Provide abortion services in legally permitted cases. Centers for major outpatient surgery Provide surgery and subsidiary services including general, local and regional anesthesia and sedation. For surgeries that require only brief post-operative care and therefore do not require overnight hospitalization. Dialysis centers For patients with failed kidneys. Diagnostic centers Dedicated to diagnostic, analytic and imaging services. Mobile health care centers Carry human and technical means for the purpose of health care activities. Transfusion centers Carry out all activities related to the extraction and verification of human blood and its components, and of treatment, storage, and distribution. Tissue banks Conserve and guarantee the quality of tissues after they are obtained and until they are used as allografts or