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. 2015 Jun 10;6(3):211–217. doi: 10.1016/j.phrp.2015.05.003
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    Survey form
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      Household survey (interviewing 1 household member)
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      Individual survey (interviewing all household members)
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    Common survey in all administrative areas (Si·Gun·Gu)

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    Rotating index consideration starting in 2010