[1] Columbia Univ, Dept Med, New York, NY 10032 USA
[2] Univ Washington, Dept Pathol, Diabet & Obes Ctr Excellence, Seattle, WA 98109 USA
[3] Columbia Univ, Dept Anat & Cell Biol, New York, NY 10032 USA
[4] Columbia Univ, Dept Physiol & Cellular Biophys, New York, NY 10032 USA