[Comment: "Even low levels had a strong effect, researchers find" The very definition of MCS = low levels, strong effect.]
Lead Exposure May Raise Blood Pressure in Pregnancy
http://www.nlm.nih.gov/medlineplus/news/fullstory_108593.html
http://www.nlm.nih.gov/medlineplus/news/fullstory_108593.html
"In pregnant women, even small amounts of lead in the blood may cause significantly higher blood pressure, new research suggests."