Funding for this research was provided by:
Seventh Framework Programme (260777)
Text and Data Mining valid from 2019-04-04
Received: 11 November 2018
Revised: 24 February 2019
Accepted: 25 March 2019
First Online: 4 April 2019
Compliance with ethical statements
: The authors declare that they have no conflict of interest.
: The research ethics committee of the Coombe Women and Infants University Hospital approved the study.
: Informed consent was not required because of the retrospective nature of the study.