PIH usually represents various cutaneous disorders This is due to various preceding disease processes that affect the skin. If the basal cell layer of the epidermis is ruptured the condition becomes severe. PIH can also be seen following treatment with a number of electromagnetic devices such as lasers, light-emitting diodes, and secondary to microdermabrasion.
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.
Last date updated on June, 2014