Affiliation: | 1. Department of Obstetrics and Gynecology, University of Florida College of Medicine, Jacksonville, FL;2. Clinical Biostatistics Unit, Ramon y Cajal Hospital, Madrid, and CIBER Epidemiologia y Salud Publica (CIBERESP), Barcelona, Spain;3. Institute of Medical Statistics, Computer Sciences and Documentation, Jena University Hospital, Friedrich Schiller University, Jena, Germany |