Obstetric Labor, Premature

• The First People's Hospital of Hefei — Hefei, Anhui, China
• Xiamen Women's and Children's Health Centre — Xiamen, Fujian, China
• People's Hospital of Zhangzhou — Zhangzhou, Fujian, China
• The Second Affiliated Hospital of Guangzhou Medical University — Guangzhou, Guangdong, China

• Fondazione Policlinico Gemelli — Rome, Italy

• Lucile-Packard Children's Hospital at Stanford — Stanford, California, United States

• Physical Education School — Pelotas, Rio Grande do Sul, Brazil

• Polish Mother's Memorial Hospital- Research Institute — Lodz, Poland

• Regional Neonatal ICU and CCN, University of Alabama at Birmingham — Birmingham, Alabama, United States

• Marmara University School of Medicine — Istanbul, Turkey (Türkiye)

• Regional Neonatal ICU and CCN, University of Alabama at Birmingham — Birmingham, Alabama, United States

Not specified

• Division of Research — Oakland, California, United States