Funding for this research was provided by:
L’Oréal Research & Innovation
Received: 18 March 2020
Accepted: 20 May 2020
First Online: 26 June 2020
Ethics approval and consent to participate
: The research protocol was approved by the Sino-German Cosmetics Institute Ethics Review Board (Protocol 2015-033-DY-024), and was conducted according to the principles expressed in the World Medical Association Declaration of Helsinki.
: Not applicable
: The authors declare no competing interests.