1. Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California, USA.
2. University of California Health Milk Bank, San Diego, California, USA.
3. Human Milk Institute (HMI), University of California, San Diego, La Jolla, California, USA.
4. Larsson-Rosenquist Foundation Mother-Milk-Infant Center of Research Excellence (MOMI CORE), University of California, San Diego, La Jolla, California, USA.
5. Department of Pediatrics, University of California, San Diego, La Jolla, California, USA.