Funding for this research was provided by:
National Institutes of Health (PO1 NS082330)
Received: 22 February 2017
Accepted: 2 June 2017
First Online: 12 June 2017
Compliance with Ethical Standards
: All authors declare no conflicts of interest.
: This article does not contain any studies with animals performed by any of the authors. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standard.
: Informed consent was not required in this study due to the de-identified and retrospective nature of the data. The UCSF institutional review board provided approval for this study (IRB #15-16792).