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  1. Article

    Open Access

    Evaluating the effectiveness, efficiency, cost and value of contacting study authors in a systematic review: a case study and worked example

    Studies find that identifying additional study data is possible by contacting study authors or experts. What is less certain is the time taken, costs involved and value found by using this supplementary search...

    Chris Cooper, Juan Talens Bou, Jo Varley-Campbell in BMC Medical Research Methodology (2019)