A surgical procedure related to diseased mastoid cells. It is present in skull hollow space and mainly spreads from ear due to infection. This procedure is followed to treat cholesteatoma and during implant of cochlear aid. It has few risk factors which include changes in taste, weakness in face and also cause loss of hearing High-impact journals are those considered to be highly influential in their respective fields. 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 September, 2014