The degree to which individuals are inhibited or facilitated in their ability to gain entry to and to receive care and services from the health care system. Factors influencing this ability include geographic, architectural, transportational, and financial considerations, among others.

The organization and administration of health services dedicated to the delivery of health care.

Health planning and resources development agencies which function in each health service area of the United States (PL 93-641).

Wearable sound-amplifying devices that are intended to compensate for impaired hearing. These generic devices include air-conduction hearing aids and bone-conduction hearing aids. (UMDNS, 1999)

Fixed-wing aircraft or helicopters equipped for air transport of patients.

Imperfections or malformations of the heart, existing at birth.

Drugs that act on blood and blood-forming organs and those that affect the hemostatic system.

Drugs that act on blood and blood-forming organs and those that affect the hemostatic system.

Solitary or multiple collections of pus within the liver. It is usually associated with systemic manifestations of toxemia and clinical signs of disease in the right upper quadrant of the abdomen. It was known in ancient times to Hippocrates and Celsus. (Bockus, Gastroenterology, 4th ed, p3288-9)

Helminth infection of the liver caused by Echinococcus granulosus or Echinococcus multilocularis.