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Internet and telephonic IVR mixed-mode survey for longitudinal studies: choice, retention, and data equivalency.

Verma SK, Courtney TK, Lombardi DA, Chang WR, Huang YH, Brennan MJ, Perry MJ. Internet and telephonic IVR mixed-mode survey for longitudinal studies: choice, retention, and data equivalency. Ann Epidemiol. 2014 Jan; 24(1):72-4.

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