The first author is usually the student or the researcher who has undertaken the research work. First author is often also referred as the presenting author. He or She is responsible for doing the research practically along with the co-authors who might assist him/ her in the research work or might be the colleagues from the same work group. He is also responsible for preparing the manuscript and analyzing the data. Corresponding author is usually the senior author who provides the intellectual input and designs and approves the protocols to be followed in the study. He is responsible for the manuscript correction, proof reading, and whole correspondence during the paper submission, handling the revisions and re-submission of revised manuscripts up to the acceptance of the manuscripts. This is the usual practice in most cases.