1. Public Health Sciences; Fred Hutchinson Cancer Research Center; Seattle Washington United States of America
2. Environmental Genomics Group, Laboratory of Molecular Genetics; National Institute of Environmental Health Sciences; Research Triangle Park North Carolina United States of America
3. Department of Statistics; North Carolina State University; Raleigh North Carolina United States of America
4. Epidemiology Branch/Genetics, Environment and Respiratory Disease Group; National Institute of Environmental Health Sciences; Research Triangle Park North Carolina United States of America