Conflicting interests
The authors declare that there is no conflict of interest.Funding
This research received no specific grant from any funding agency in the
public, commercial, or not-for-profit sectors.Informed consent
Informed consent was not sought for the present study because it was an
analysis of routine clinical data.Ethical approval
Ethical approval was not sought for the present study because it did not
directly involve human participants. This study was completed in
accordance with the Helsinki Declaration as revised in 2013.