Document is current

Article History

Received: 6 April 2018

Accepted: 16 October 2018

First Online: 21 November 2018

Ethics approval and consent to participate

: This study was approved by the ethics committee at each participating center. The protocol has reached version 6, in which there were no changes. Relevant amendments to the protocol will be submitted to the ethics committee for further approval, as warranted. Written informed consent to the study will be obtained from the patients, patients’ next of kin, or other surrogate decision makers where appropriate. A trained investigator is collecting the informed consent documents at each site.

: The written informed consent for the analysis and publication of anonymized data will be obtained from the patients, patients’ next of kin, or other surrogate decision makers, where appropriate.

: The authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.