Funding for this research was provided by:
Japan Society for the Promotion of Science (KAKENHI 21611002, KAKENHI 25461903, KAKENHI 17K09054)
Article History
Received: 24 April 2017
Revised: 8 December 2017
Accepted: 13 December 2017
First Online: 28 December 2017
Compliance with ethical standard
:
: The authors declare that they have no conflicts of interest.
: All procedures in studies involving human participants were performed in accordance with the ethical standards of the Institutional Review Board (IRB) and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: The informed consent is not required for this type of retrospective study.
: This study did not involve animal model.