Family history can be defined as a basic knowledge of genetic of all family members. Family history plays an important role in identification of chronic hereditary diseases. Family history of diseases of individuals is different. The foremost features of family history that may initiate risk are: diseases which can be seen at an early age, diseases that occur in one or more relative such as, thalaessemia and some combination of diseases in a family such as high blood pressure and heart diseases.

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.