Concurrent validity of skin carotenoid status as a concentration biomarker of vegetable and fruit intake compared to multiple 24-h recalls and plasma carotenoid concentrations across one year: a cohort study.
Lisa JahnsLuAnn K JohnsonZach ConradMichael BukowskiSusan K RaatzStephanie Jilcott PittsYoufa WangIgor V ErmakovWerner GellermannPublished in: Nutrition journal (2019)
This trial was registered at ClinicalTrials.gov as NCT01674296.