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Longitudinal Studies

Collect information that will help locate subject:

Date of birth

Social Security Number

Expected location at follow-up

Names and addresses of >1 person who will know subject’s whereabouts

At each wave of data collection ask:

Whether contact information has changed

Plans for relocation

Maintain interim contact if time to next data collection is long and/or population is mobile

E.g., Birthday and holiday cards with return postcard for corrections

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