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The book provides basic and clear understanding of these two important disciplines in community medicine. These two important aspects of community medicine are exclusive to this subject. These are gaining Importance not only in medical science but aIso in dental, nursing, pharmacy, physiotherapy, i.e. all health related branches. The book will clear the doubts of students and also give an opportunity to understand fundamentals of the subjects with historical background and simple explanations of various study designs and biostatical inferences.
