Funding for this research was provided by:
IKW (-)
Article History
Received: 16 November 2020
Accepted: 5 February 2021
First Online: 16 February 2021
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The present study was funded by the German Cosmetic, Toiletry, Perfumery and Detergent Association (IKW).