Text and Data Mining valid from 2019-09-10
Received: 29 March 2019
Accepted: 20 August 2019
First Online: 10 September 2019
Ethics approval and consent to participate
: The study protocol was ethically reviewed and approved by the Ethics Committee of Tsukuba University (2014.7.30, no. 26–37), Japan and performed in accordance with the guidelines of the Declaration of Helsinki Declaration and the 2010 Consolidated Standards of Reporting Trials statement. This study was retrospectively registered in the University Hospital Medical Information Network Clinical Trial Registry (Japan, registration no. UMIN000036036).
: Not applicable.
: This research received financial support from MORINAGA & CO., Ltd. (Tokyo, Japan). EN, ST, HM-U, and MM are employees of MORINAGA & CO., Ltd. The other authors declare that they have no competing interests.