The natural approach is undertaken by all the researchers regarding critical literature review is to make a target oriented attempt to categorize all the existing writings in to different relevant groups or classifications that fall within our area of interest and to find out main pillars of our discussion to support our research gaps as a point of helping argument in our study. Identifying all the principal authors of different research works by "backtracking" from a well-known, recent contribution to the oldest contributions in the same area of work. Same is the case with the present study, where literature review of all relevant work has been rigorously attempted to find out research gaps or research questions.

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