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In a study of smoking and dementia in older adults, Mr. Jones enrolled on January 1, 2009. On December 31, 2013, he was diagnosed with

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In a study of smoking and dementia in older adults, Mr. Jones enrolled on January 1, 2009. On December 31, 2013, he was diagnosed with dementia. He died of a heart attack on December 31, 2017. How many person-years at risk did Mr. Jones contribute to this study

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