Updates are available Correction dated 2018-09-19

Article History

Received: 6 June 2017

Accepted: 15 May 2018

First Online: 9 July 2018

Change Date: 19 September 2018

Change Type: Correction

Change Details: Following publication of the original article [1], the author reported an error in the Title. The original article has been corrected.

Ethics approval and consent to participate

: The NHFD is approved by the NHS England Health Research Authority Confidentiality Advisory Group to collect patient data without consent under Section 251 exemption, so no ethical approval was required for this study.

: The authors declare that they have no competing interests.

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