1David B. Allisonis a distinguished professor in the Department of Biostatistics, School of Public Health, University of Alabama at Birmingham, Alabama, USA.
2Andrew W. Brownis a scientist in the Office of Energetics and the Nutrition Obesity Research Center, University of Alabama at Birmingham, Alabama, USA.
3Brandon J. Georgeis a statistician in the Office of Energetics, University of Alabama at Birmingham, Alabama, USA.
4Kathryn A. Kaiseris an instructor in the Office of Energetics and the Nutrition Obesity Research Center, University of Alabama at Birmingham, Alabama, USA.
ae-mail:[email protected]
D.B.A. declares competing financial interests: see go.nature.com/hshkkk for details.
Published online 3 February 2016