About the Authors

Kelli K. Ryckman

Affiliation Department of Molecular Physiology and Biophysics and Center for Human Genetics Research, Vanderbilt University, Nashville, Tennessee, United States of America

Nils-Halvdan Morken

Affiliations Department of Obstetrics and Gynecology, Haukeland University Hospital, Bergen, Norway, Norwegian Institute of Public Health, Oslo, Norway

Marquitta J. White

Affiliation Department of Molecular Physiology and Biophysics and Center for Human Genetics Research, Vanderbilt University, Nashville, Tennessee, United States of America

Digna R. Velez

Affiliation Dr. John T. Macdonald Foundation Department of Human Genetics and Miami Institute of Human Genomics, Miller School of Medicine, University of Miami, Miami, Florida, United States of America

Ramkumar Menon

Affiliations The Perinatal Research Center, Nashville, Tennessee, United States of America, Department of Epidemiology, Emory University, Atlanta, Georgia, United States of America

Stephen J. Fortunato

Affiliations The Perinatal Research Center, Nashville, Tennessee, United States of America, Department of Epidemiology, Emory University, Atlanta, Georgia, United States of America

Per Magnus

Affiliation Norwegian Institute of Public Health, Oslo, Norway

Scott M. Williams

smwilliams@chgr.mc.vanderbilt.edu

Affiliation Department of Molecular Physiology and Biophysics and Center for Human Genetics Research, Vanderbilt University, Nashville, Tennessee, United States of America

Bo Jacobsson

Affiliations Perinatal Center, Department of Obstetrics and Gynecology, Institute of Clinical Sciences, Sahlgrenska Academy, Gothenburg, Sweden, Department of Obstetrics and Gynecology, Rikshospitalet, Oslo, Norway

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KKR NHM PM SMW BJ. Performed the experiments: KKR NHM SMW. Analyzed the data: KKR MJW SMW. Contributed reagents/materials/analysis tools: NHM MJW DRV RM SJF PM BJ. Wrote the paper: KKR SMW BJ.