Ethical considerations
The study was conducted according to the principles of the Declaration
of Helsinki (10th version, October 2013, see for the most recent
version: www.wma.net (World Medical Association 2013)) and in accordance
with the Dutch Medical Research Involving Human Subjects Act (WMO).
Approval from the medical ethics comity of the Erasmus Medical Center
was given for conducting our retrospective case-series study in these
patients.