Obstetric Labor, Premature

• Loma Linda University Children's Hospital — Loma Linda, California, United States
• University of Iowa Children's Hospital — Iowa City, Iowa, United States
• University of North Carolina at Chapel Hill North Carolina Children's Hospital — Chapel Hill, North Carolina, United States

• Zekai Tahir Burak Women's Health and Education Hospital — Ankara, Turkey (Türkiye)

• Christiana Care Health System — Newark, Delaware, United States

• Massachusetts General Hospital — Boston, Massachusetts, United States

• University of Utah — Salt Lake City, Utah, United States

• My Duc Hospital — Ho Chi Minh City, Tan Binh District, Vietnam

• Federal Uiversity of São Paulo — São Paulo, Brazil

• Johns Hopkins Medical Institutions — Baltimore, Maryland, United States

• Universidade Eduardo Mondlande, Faculty of Medicine, Department of Community Health — Maputo, Mozambique

Not specified