Funding for this research was provided by:
Ministry of Education, Culture, Sports, Science and Technology (A129)
Received: 3 November 2019
Accepted: 1 March 2020
First Online: 27 March 2020
: I.A. belongs to the Division of Advanced Dental Devices and Therapeutics, Faculty of Dental Science, Kyushu University. This division is endowed by GC Corporation, Tokyo, Japan. GC Corporation had no specific roles in the conceptualisation, design, data collection, analysis, decision to publish, or preparation of the manuscript. All other authors declare they have no competing interests.