Funding for this research was provided by:
Received: 21 May 2019
Accepted: 26 May 2020
First Online: 6 June 2020
Ethics approval and consent to participate
: Ethics approval was waived due to the retrospective nature of the study.
: Not applicable.
: PJB, MD and MSD are employees of Analysis Group Inc., a consulting company that has received consultancy fees and research funds from AstraZeneca to conduct this study<i>.</i> TO, RS and HY are employees of AstraZeneca<i>.</i>