Funding for this research was provided by:
School for Social Care Research (386)
Text and Data Mining valid from 2018-12-01
Received: 26 July 2018
Accepted: 12 November 2018
First Online: 20 December 2018
Ethics approval and consent to participate
: The protocol was approved by the Independent Scientific Advisory Committee (ISAC) of the MHRA (ISAC protocol number 17_06R). Ethics approval for observational research using the CPRD with approval from ISAC was granted by a National Research Ethics Service committee (Trent MultiResearch Ethics Committee, REC reference number 05/MRE04/87).
: Not applicable.
: The authors declare that they have no competing interests.
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