PMC:4137988 / 39100-39239 JSONTXT

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{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/4137988","sourcedb":"PMC","sourceid":"4137988","source_url":"https://www.ncbi.nlm.nih.gov/pmc/4137988","text":"Age, smoking, pack-years, pack-years2, race/ethnicity, physician visits, US region, BMI, physical activity, multivitamin use, energy intake","tracks":[]}