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Implementing the PHMRC shortened questionnaire: Survey duration of open and closed questions in three sites

Fig 1

Diagram showing the number of observations used in the analysis by site.

In the first step data from the closed and open sections are linked. The data from Sri Lanka did not have a unique identifier and was matched on interview date, birth date and death date.

Fig 1

doi: https://doi.org/10.1371/journal.pone.0178085.g001