Funding for this research was provided by:
National Institute of Biomedical Imaging and Bioengineering (1UG3EB024965-01)
Accepted: 25 September 2019
First Online: 1 November 2019
Compliance with ethical standards
: HW is cofounder and shareholder in Metabolomics Technologies Inc., while LD, KPI, and DC are employees of Metabolomics Technologies Inc.