|A health system, also occasionally denoted to as health care system or healthcare system is the association of people, institutions, and incomes that carry health care services to encounter the health needs of target populations. There is an extensive diversity of health systems about the world, with as many histories and organizational structures as there are nations.
The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.