Evaluation of the effectiveness of an incentive strategy on the questionnaire response rate in parents of premature babies: a randomised controlled Study Within A Trial (SWAT) nest... by Edmund Juszczak, Oliver Hewer, Christopher Partlett, Madeleine Hurd, Vasha Bari, Ursula Bowler, Louise Linsell, Jon Dorling, on behalf of the SIFT Investigator Group

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