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Table 1.

Questionnaire used for screening.

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Table 2.

Background characteristics of respondents.

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Table 3.

Classification of cases and controls from screening.

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Table 4.

Validation of the overall classifications from the questionnaire compared to true disease status.

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Table 4 Expand

Table 5.

Validation of the individual screening questions compared to true disease status.

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Table 5 Expand