Ieko, Masahiro http://orcid.org/0000-0003-1854-4543
Hotta, Taeko
Watanabe, Kumiko
Adachi, Tomoko
Takeuchi, Sawako
Naito, Sumiyoshi
Yoshida, Mika
Ohmura, Kazumasa
Takahashi, Nobuhiko
Morishita, Eriko
Tsuda, Hiroko
Kang, Dongchon
Article History
Received: 23 February 2020
Revised: 22 November 2020
Accepted: 23 November 2020
First Online: 8 January 2021
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was approved by the Ethics Committee of the School of Dentistry at the Health Sciences University of Hokkaido (No. 148 and 192) and the Medical Ethics Committee of the Aiiku Maternal and Child Health Center (No. 152).
: All subjects provided informed consent before study participation.