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We have a limited understanding of the biological mechanisms for such effects, wrote genetic epidemiologist Christina Markunas and perinatal epidemiologist Allen Wilcox of the National Institute of Environmental Health Sciences in Research Triangle Park, North Carolina, in a joint e-mail to Science

These physiological changes will be evident in laboratory tests but not necessarily felt by the individual

Rogers later worked in a hospital for incapacitated patients outside Palo Alto, California, and for six years she was a part-time social worker, involved in substance-abuse counseling