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A good review of earlier research works gives better understanding of research topic. The available research literature on the topic must be searched before designing protocol and defining the need of research. Then after analyzing the literary data, one can know the pitfalls/shortcomings in the earlier works. The he can decide what additions, continuations, modifications are needed on his part? This is highly needed to be done by new researchers and scholars. Science can only be developed further by adding and innovating.Read less