Text and Data Mining valid from 2018-11-21
Received: 10 May 2018
Revised: 6 September 2018
Accepted: 19 September 2018
First Online: 21 November 2018
Compliance with ethical standards
: CTD is an employee, Director and shareholder of P1vital Limited and a Director and shareholder of P1vital Products Limited. The remaining authors declare that they have no conflict of interest.