Text and Data Mining valid from 2018-12-31
Received: 8 June 2018
Accepted: 20 November 2018
First Online: 31 December 2018
: There is a potential competing interest: T. Shimizu is a shareholder and a member of the scientific advisory board of CellSeed Inc. Tokyo Women’s Medical University receives a research fund from CellSeed Inc. All other authors have no competing interests.