Received: 11 September 2019
Accepted: 4 November 2019
First Online: 2 December 2019
Ethics approval and consent to participate
: All patients signed a written consent for evaluation of their data and the institutional review board of the Technical University Munich (permit 5665/13) and University of California Los Angeles (permit 17-000330) approved this analysis.
: Not applicable.
: The authors declare that they have no competing interests.