Funding for this research was provided by:
National Institutes of Health (R01 DE 019431, R01 DE 013417)
Article History
Received: 29 January 2018
Accepted: 13 April 2018
First Online: 3 May 2018
Compliance with ethical standards
: The Institutional Review Board at the University of Michigan approved the use of the skin, and donors provided informed consent for research use.
: The authors declare that they have no conflict of interest.