Ketema, Rahel Mesfin
Araki, Atsuko
Ait Bamai, Yu
Saito, Takeshi
Kishi, Reiko
Funding for this research was provided by:
Ministry of Health, Labour and Welfare ((H20-Kenki Ippan-009)(H26-Kenki Ippan-006)(19LA1007)(19CA2016))
Article History
Received: 12 March 2020
Accepted: 29 June 2020
First Online: 11 July 2020
Ethics approval and consent to participate
: This study’s protocol was approved by the ethical board for epidemiological studies at the Hokkaido University Graduate School of Medicine in September 24, 2008. Written consent was obtained from the guardian/parent of each participating child.
: Not applicable
: The authors declare no competing interests.