1. Department of Epidemiology and Biostatistics Texas A&M University College Station TX USA
2. Division of Adolescent and Young Adult Medicine Department of Pediatrics UPMC Children's Hospital of Pittsburgh University of Pittsburgh School of Medicine Pittsburgh PA USA
3. Division of Maternal‐Fetal Medicine and Perinatal Research Department of Obstetrics and Gynecology The University of Texas Medical Branch at Galveston Galveston TX USA
4. Department of Environmental and Occupational Health Texas A&M University College Station TX USA
5. Department of Epidemiology and Biostatistics College of Public Health Temple University Philadelphia PA USA