Funding for this research was provided by:
Materna Medical Inc
Text and Data Mining valid from 2018-02-06
Received: 16 August 2017
Accepted: 4 January 2018
First Online: 6 February 2018
Compliance with ethical standards
: FJ Orejuela and SM Ramin received salary support from Materna Medical Inc.HP Dietz receives unrestricted educational grant support from GE.None of the other authors has any conflicts of interest to disclose.