Friederichsen, Lena
Nebel, Sabine http://orcid.org/0000-0002-8205-2327
Zahner, Catherine
Bütikofer, Lukas
Stute, Petra
Funding for this research was provided by:
Max Zeller Söhne AG
Article History
Received: 10 May 2019
Accepted: 30 October 2019
First Online: 16 November 2019
Compliance with ethical standards
:
: This is an investigator-initiated monocentric, retrospective, observational study. The study was supported by Max Zeller Söhne AG, Romanshorn. Catherine Zahner and Sabine Nebel are employees of Max Zeller Söhne AG. The authors were autonomous in data analyses and study report and declare no conflict of interest.
: Informed consent is not available as data are used retrospectively which have been collected already and it is impossible or disproportionately difficult to obtain consent due to the high number of patients.
: In addition, documented refusal is not available in any of the patient files (as per clinical trial protocol approved by the cantonal ethics committee No 2016-01179).