1. Department of Environmental Health; University of Cincinnati; Cincinnati Ohio USA
2. Division of Asthma Research; Cincinnati Children's Hospital Medical Center; Cincinnati Ohio USA
3. Department of Internal Medicine; University of Cincinnati College of Medicine; Cincinnati Ohio USA
4. Georgetown University Medical School; Washington D.C. USA
5. Departments of Pediatrics and Preventive Medicine; Icahn School of Medicine at Mount Sinai; New York NY USA
6. Division of Biostatistics and Epidemiology; Cincinnati Children's Hospital Medical Center; Cincinnati Ohio USA