Answers are grounded in this paper and cite their sources.
This paper reminds readers of this journal of an important source of summaries of the evidence for effectiveness of healthcare interventions, namely the Cochrane Database of Systematic Reviews.
No takes yet. Share an insight, caveat, or question.
Helen HG Handoll (2004) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: