Funding for this research was provided by:
Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Sciences (JSPS) and from the Ministry of Education, Culture, Sports, Science and Technology (18K06780)
Text and Data Mining valid from 2019-03-08
Received: 14 November 2018
Accepted: 15 February 2019
First Online: 8 March 2019
Compliance with ethical standards
: This research involved human subject participants. All patients and/or parents gave written informed consent to participate in the present study, which was approved by the ethics committee of the University of Toyama.
: The authors declare that they have no conflicts of interest.