If the lead exposure is a threshold effect, most of the population might have already banked the benefits of going below it. Experts claim there is "no thresho

If the lead exposure is a threshold effect, most of the population might have already banked the benefits of going below it. Experts claim there is "no threshold"[1]. [1]http://www.chem.unep.ch/pops/pdf/lead/leadexp.pdf http://www.chem.unep.ch/pops/pdf/lead/leadexp.pdf