Infant, Extremely Low Birth Weight

• University of Alabama at Birmingham — Birmingham, Alabama, United States
• Stanford University — Palo Alto, California, United States
• Sharp Mary Birch Hospital for Women & Newborns — San Diego, California, United States
• University of Colorado — Aurora, Colorado, United States

• University of Alabama at Birmingham — Birmingham, Alabama, United States
• Stanford University — Palo Alto, California, United States
• Emory University — Atlanta, Georgia, United States
• Indiana University — Indianapolis, Indiana, United States

• Children's Hospital of Orange County — Los Angeles, California, United States
• Santa Clara Valley Medical Center — San Jose, California, United States
• Tufts Medical Center — Boston, Massachusetts, United States
• CHI St. Elizabeth's Medical Center — Lincoln, Nebraska, United States

• University of Alabama at Birmingham — Birmingham, Alabama, United States
• University of California - Los Angeles — Los Angeles, California, United States
• Stanford University — Palo Alto, California, United States
• Emory University — Atlanta, Georgia, United States

• Nagano Children's Hospital — Azumino, Nagano, Japan

Not specified

• Haukeland University Hospital — Bergen, Norway
• Stavanger University Hospital — Stavanger, Norway