Funding for this research was provided by:
National Research Foundation of Korea (2014K1A1A2043032)
Colgate-Palmolive (N/A)
Article History
Received: 21 April 2019
Revised: 20 May 2019
Accepted: 28 May 2019
First Online: 15 June 2019
Compliance with ethical standards
: This work does not contain any studies with humans or animals performed by any of the authors.
: The authors declare that they have no conflict of interest.