Funding for this research was provided by:
Johannes Kreyenbühl Foundation
Received: 25 January 2019
Accepted: 10 October 2019
First Online: 4 November 2019
Ethics approval and consent to participate
: This study was approved by the ethics committee of canton Zurich (KEK-ZH-Nr. 2014–0717, approval date 12.05.2015). Written informed consent was obtained the day before surgery.
: Not applicable.
: MM is an employee of Weleda AG, the company that produces the preparations of <i>Bryophyllum pinnatum</i>. APSW received research funding from Weleda AG during the last 5 years.