Funding for this research was provided by:
Gates Cambridge Trust
National Institute of Diabetes and Digestive and Kidney Diseases (R01DK0091831)
Nutrition Science Initiative (unrestricted gift)
Stanford Child Health Research Institute
Stanford Clinical and Translational Science Award
Received: 26 November 2016
Accepted: 7 August 2017
First Online: 15 September 2017
Ethics approval and consent to participate
: This research was approved by the Panel on Human Subjects in Medical Research (#22305) at Stanford University, Stanford, CA, USA. All participants provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.