ABSTRACT
An essential part of human evolution has been the development of scientific knowledge in almost any aspect of human life, with the main intention of improving the quality of life and preventing diseases, among others. Today, advances in the field of healthcare have brought a significant increase in life expectancy and all of that is a result of years of research and development. In the 13th century, the average life span at birth was only about 35 years [1], whereas now estimations suggest that the life expectancy of the global population will be 73.16 years by 2020. While living longer is desirable; the constantly growing and aging population that currently lives in the world (about 7.7 billion humans in July 2014, est. [2]) brings consequences that impact directly on World economy. Every year, governments designate higher resources to attend the demand of more complex health services. Furthermore, the existence of multiple armed conflicts related to cultural differences, religious intolerance, and political issues, among others, has made it extremely difficult to cover the right to health of every human being [3], mainly in countries or regions underdeveloped in contrast with developed ones.
