Received: 1 April 2019
Accepted: 6 June 2019
First Online: 26 June 2019
Ethics approval and consent to participate
: This study was approved by the medical ethics committee of the Erasmus University Medical Center: MEC-2006-252. Medical ethics committees at each participating center approved the study protocol, and written informed consent was obtained for all patients.
: Not applicable.
: The authors declare that they have no competing interests.