Is recruitment more difficult with a placebo arm in randomised controlled trials? A quasirandomised, interview based study 期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Is recruitment more difficult with a placebo arm in randomised controlled trials? A quasirandomised, interview based study

作者姓名：	Welton AJ Vickers MR Cooper JA Meade TW Marteau TM

摘要：
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