1. Department of Biostatistics; University of Kentucky; Lexington Kentucky United States of America
2. Department of Community Medicine and Heath Care, Institute for Systems Genomics; University of Connecticut Health Center; Farmington Connecticut United States of America
3. Summer Internship Program, National Institute of Environmental Health Sciences; National Institutes of Health; Durham North Carolina USA
4. The Alan Edwards Centre for Research on Pain; McGill University; Montreal Canada
5. National Institute of Environmental Health Sciences; National Institutes of Health; Durham North Carolina USA