Funding for this research was provided by:
National Institute of Diabetes and Digestive and Kidney Diseases (R18DK083936)
First Online: 11 February 2019
Compliance with Ethical Standards
: All authors declare that they have no conflict of interest.
: 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 standards.
: The research protocol was approved by the Johns Hopkins Medical Institutions Institutional Review Board, and written consent was obtained from all study participants.
: Informed consent was obtained from all individual participants included in the study.