After a paper is submitted to a journal, it generally goes in for peer review analysis. But there are instances when the paper is rejected even before it reaches the peer review stage. This happens because the paper does not conform to the scope or the technical specifications of the concerned journal, and is therefore unilaterally rejected by the editor. In most high impact factor journals, about 5% of the submitted papers are accepted. It is very important to understand and analyse the possible reasons for rejection, so as to avoid any such issues in the future.
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