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Cell phone use and behavioural problems: indications of unobserved heterogeneity in Divan et al's study

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Footnotes

  • Linked articles 132563.

  • Competing interests None.

  • Provenance and peer review Not commissioned; not externally peer reviewed.

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    Hozefa A Divan Leeka Kheifets Carsten Obel Jørn Olsen