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Researchers publishing in large teams (11+ authors) were excluded. The average field and year normalized citation impact of long- and shorter-term U.S. researchers\u2019 journal articles decreases over time relative to the national average, with especially large falls for the last articles published, which may be at least partly due to a decline in self-citations. In many cases researchers start by publishing above U.S. average citation impact research and end by publishing below U.S. average citation impact research. Thus, research managers should not assume that senior researchers will usually write the highest impact papers.<\/jats:p>","DOI":"10.1162\/qss_a_00072","type":"journal-article","created":{"date-parts":[[2020,6,15]],"date-time":"2020-06-15T20:51:24Z","timestamp":1592254284000},"page":"1334-1348","update-policy":"https:\/\/doi.org\/10.1162\/mitpressjournals.corrections.policy","source":"Crossref","is-referenced-by-count":8,"title":["All downhill from the PhD? 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