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a International incidence of NENs overall per 100,000 persons; b Incidence of high-grade lung NEN, and low-grade and high-grade NENs per 100,000 persons in the United States, 1973–2012; c Incidence of low-grade NENs per 100,000 persons by primary site, in the United States, 1973–2012; d Incidence of high-grade NENs per 100,000 persons by primary site, in the United States, 1973–2012
