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Explanation: This has always been a major issue with all the major American journal publishers such as the American Chemical Society and Plenum Press...the consensus is that, if for no other reason, it saves a hell of a lot of type in printing..plus...any study (investigation) is ipso facto "scientific"..plus "study" is preferred over "investigation" for the same reason
a hell of a lot of hard-earned experience with editors over 30 years