The Health Services sector comprises establishments providing health care for individuals. This sector includes hospitals, outpatient health care services, nursing and residential care facilities. Hospitals provide medical, diagnostic, and treatment services that include physician, nursing, and other health services to inpatients and the specialized accommodation services required by inpatients. Hospitals may also provide outpatient services as a secondary activity. Establishments in the Hospitals subsector provide inpatient health services, many of which can only be provided using the specialized facilities and equipment that form a significant and integral part of the production process. Outpatient Health Care Services provide health care services directly or indirectly to ambulatory patients and do not usually provide inpatient services. Health practitioners in this subsector provide outpatient services, with the facilities and equipment not usually being the most significant part of the production process. Nursing and Residential Care Facilities provide residential care combined with either nursing, supervisory, or other types of care as required by the residents. In this subsector, the facilities are a significant part of the production process and the care provided is a mix of health and social services with the health services being largely some level of nursing services. In general, the services provided by establishments in the Health Services sector are delivered by trained professionals. All industries in the sector share this commonality of process, namely, labor inputs of health practitioners with the requisite expertise. Many of the industries in the sector are defined based on the educational degree held by the practitioners included in the industry.