Article History
Received: 4 August 2017
Revised: 7 March 2018
Accepted: 3 April 2018
First Online: 30 May 2018
Compliance with ethical standards
:
: The study was sponsored by Alsitan GmbH (Greifenberg, Germany). The sponsor provided honoraria to the authors for the statistical planning and evaluation, case data compilation and reporting. The sponsor was not involved in the planning, execution, evaluation and publication of the clinical trial. These tasks were carried out under the responsibility of the principal investigator.