Telephone follow-up to a mail survey: when to offer an interview compared to a reminder call by Ziegenfuss Jeanette Y, Burmeister Kelly R, Harris Ann, Holubar Stefan D, Beebe Timothy J

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The Reflux Disease Questionnaire: a measure for assessment of treatment response in clinical trials by Junghard Ola, Beebe Timothy, Dent John, Shaw Michael, Wiklund Ingela, Lind Tore, Johnsson Folke

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Getting physicians to open the survey: little evidence that an envelope teaser increases response rates by Ziegenfuss Jeanette Y, Burmeister Kelly, James Katherine M, Haas Lindsey, Tilburt Jon C, Beebe Timothy J

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