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Supplementary Data 1. Details of pre-survey procedures and the survey system: Computer-assisted telephone interview (CATI).

Supplementary Data 2. The final questionnaire for computer-assisted telephone interview (CATI).

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FilenameFormatSizeDescription
PCN_2067_sm_sm1.doc33KSupporting info item
PCN_2067_sm_sm2.doc47KSupporting info item

Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.