Funding for this research was provided by:
the Budget for promoting science and technology in Japan
Text and Data Mining valid from 2018-04-27
Received: 22 January 2018
Revised: 23 March 2018
Accepted: 26 March 2018
First Online: 27 April 2018
: This study was approved by the Animal Care and Use Committee of the National Center for Geriatrics and Gerontology (NCGG) (animal 25-24: national guideline) and Shin Nippon Biomedical Laboratories, Ltd (IACUC 860-013, 015: international guideline). All experiments were conducted using the strict guidelines of DNA Safety Programs.
: The authors declare that they have no competing interests.
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