Authors' response

The range of our scoping review literature search was 2004 through May 2017; over 1 year later, the peer review process was complete, and the article was published. So it is no surprise that more articles have been published since we completed our search, and we are glad to learn of the 2 mentioned by Dr Hudson. We wonder, however, whether Dr. Hudson has correctly interpreted the meaning of those articles. To clarify this matter, we contacted Dr Manfredini, whose works are extensively cited to support Dr Hudson's arguments.

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