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source titles records % of 12978 journal of clinical oncology 465 3.583 diseases of the esophagus 422 3.252 international journal of radiation oncology biology physics 411 3.167 annals of surgical oncology 328 2.527 world journal of gastroenterology 263 2.027 plos one 235 1.811 gastroenterology 235 1.811 annals of oncology 225 1.734 esophagus ... ................
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