Cross-sectional studies and methodology: reply to comment by Erkoyun.
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Patil
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Uusi-Rasi
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Pasanen
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Kannus
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Karinkanta
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Sievänen
D001851:Bone Diseases, Metabolic / Q000453:epidemiology*; D005260:Female; D006801:Humans; D055948:Sarcopenia / Q000453:epidemiology*