Funding for this research was provided by:
FP7 People: Marie-Curie Actions (PIOF-GA-2013-629981)
School of Medicine, Duke University (NIH-UL1TR001117)
Received: 1 March 2018
Accepted: 14 May 2018
First Online: 14 June 2018
Ethics approval and consent to participate
: All participants gave written informed consent, and the study was approved by the Duke University Medical Center Institutional Review Board (IRB no. Pro00064057).
: The sponsors had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. All authors declare that they have no competing interests.
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