Normal University, Philippine State College of Aeronautics, Polytechnic University of the Philippines, Rizal Technological University and the Technological University of the Philippines, are based in Metro Manila. Manila's University Belt form the largest concentration of higher education institutes in the Philippines, making Manila the center for higher learning in the country. The country's top ranked universities, colloquially known as the "Big Four", located in Metro Manila, are widely known to be as follows, University of the Philippines System, Ateneo de Manila University, De La Salle University, and University of Santo Tomas. Prominent secondary schools in Metro Manila include the Philippine Science High School in Diliman, Quezon City, the national science school of the Philippines and the Manila Science High School in Ermita, the forerunner of all the science schools in the country. Primary and secondary education is in the region is governed by the Department of Education-National Capital Region (DepEd-NCR). Meanwhile, the higher educational institutions are under the CHED-National Capital Region. The region has the highest literacy rate among all the regions of the Philippines, with 99.2% in 2008. Literacy rate for males is at 99.0% while literacy rate for females is at 99.4%. For the school year of 2008–2009, Metro Manila has 511 public elementary schools and 220 public secondary schools. There are 309 tertiary (public and private) institutions as of the year-end of 2009. For the said school year, enrollment in public elementary schools is at 1,219,333, public secondary schools at 661,019 and 687,096 for tertiary (public and private) institutions. Public health Healthcare in Metro Manila is mostly provided by private corporations. 72% of region's hospitals are privately owned. , the region has 179 hospitals. Quezon City has the most hospitals while Valenzuela and Pateros do not have any. In 2008, government health workers in NCR comprises 590 doctors, 498 dentists, 4,576 nurses, and 17,437 midwives. Furthermore, Metro Manila has 27,779 beds with a ratio of 2.47 per 1,000 population . The region has the lowest malnutrition rate among all the regions in the country. The headquarters of the World Health Organization Regional Office for the Western Pacific, and the World Health Organization Country Office for the Philippines are in the region. The main office of the Department of Health, the national health department, is also in the region. Metro Manila is designated by the Department of Health as the pioneer of medical tourism, expecting it to generate