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Portable Document Format (PDF)

Portable Document Format (PDF)

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The Influence of Response Mode on Study Results: Offering Cigarette Smokers a Choice of Postal or Online Completion of a Survey | Callas | Journal of Medical Internet Research <body> <table width="100%"> <tr> <td align="center"> This page requires frames. <a href="https://www.jmir.org/article/viewPDFInterstitial/jmir_v2010i4e46/2">Click here</a> for the non-frames version. </td> </tr> </table> </body>