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The United States of America (USA) is a developed country, commonly referred to as the United States (U.S.) or America. It is a federal republic composed of 50 states, the federal district of Washington DC, five major territories. In central North America between Canada and Mexico, there are 48 contiguous states and Washington DC. The state of Alaska is in the northwestern part of North America and the state of Hawaii is an archipelago in the mid-Pacific. The territories are scattered about the Pacific Ocean and the Caribbean Sea.
The United States of America is the world's third largest country in size and nearly the third largest in terms of population. Located in North America, the country is bordered on the west by the Pacific Ocean and to the east by the Atlantic Ocean. Along the northern border is Canada and the southern border is Mexico. The United States, with its large size and geographic variety, includes most climate types. To the east of the 100th meridian, the climate ranges from humid continental in the north to humid subtropical in the south.
The United States has a capitalist mixed economy which is fueled by abundant natural resources and high productivity. The United States is the largest importer of goods and second largest exporter, though exports per capita are relatively low. The country ranks ninth in the world in nominal GDP per capita and sixth in GDP per capita. The U.S. dollar is the world's primary reserve currency. The Division of Diabetes and Endocrinology has enjoyed unprecedented growth in the country.
This country has given 357 Noble laureates to the World out of which 100 awards from Physiology/Medicine. Health care spending in the U.S. far exceeds that of other high-income countries, though spending growth has slowed in the U.S. and in most other countries in recent years. Health care facilities are largely owned and operated by private sector businesses. According to the World Health Organization (WHO), the United States spent more on health care per capita ($8,608), and more on health care as percentage of its GDP (17.2%), than any other nation in 2011. Agency of Healthcare research and Quality (AHCPR) was a constituent unit of the Public Health Service (PHS) to enhance the quality, appropriateness, and effectiveness of health care services and access to care by conducting and supporting research, demonstration projects, and evaluations, developing guidelines, and disseminating information on health care services and delivery systems. Columbia University Medical Center, University of Masachusetts, Stanford Medicine, University of UTAH are some of the healthcare institutes carrying research on healthcare. List of Healthcare Journals include American Journal of Medicine, Health services Research, American Journal of Health Research, American Journal of Public Health .