Received: 10 September 2019
Accepted: 18 November 2019
First Online: 6 December 2019
Ethics approval and consent to participate
: This study was approved by the audit department in the Golden Jubilee National Hospital, Glasgow, United Kingdom. Individual patient consent was waived because this study did not interfere with patient treatment, and the database was designed so that individual patients could not be identified. All baseline and clinical characteristics were obtained from the medical record of patients.
: Not applicable.
: The authors declare that they have no competing interests.