引证研究：系统性综述前提下的研究

Towards evidence based research

Hans Lund和同事们认为，为了避免研究的浪费，在开展任何新研究之前，都应该系统地回顾现有的证据。

To avoid waste of research, no new studies should be done without a systematic review of existing evidence, argue Hans Lund and colleagues