1. Department of Epidemiology The Geisel School of Medicine at Dartmouth Hanover NH USA
2. Center for Molecular Epidemiology The Geisel School of Medicine at Dartmouth Hanover NH USA
3. Department of Biostatistics University of Florida Gainesville FL USA
4. The Dartmouth Institute Lebanon NH USA
5. Josephine Bay Paul Center Marine Biological Laboratory Woods Hole MA USA
6. Division of Neonatology Department of Pediatrics Children's Hospital at Dartmouth Lebanon NH USA