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  "pdf_url": "https://www.nature.com/articles/s41598-026-74755-2.pdf",
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  "published": "2026-10-09",
  "publisher": "Springer Science and Business Media LLC",
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  "title": "Self-reported sleep quality, physical activity and anxiety associated with heart rate variability in youth tiers derived via unsupervised machine learning",
  "title_text": "Self-reported sleep quality, physical activity and anxiety associated with heart rate variability in youth tiers derived via unsupervised machine learning",
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  "venue": "Scientific Reports",
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