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Mean mercury concentration in serum and urine at pre-treatment examination and at follow-up after removal of amalgam fillings. Mean mercury concentration (and s.d.) in serum (nmol L−1) and urine (nmol per mmol creatinine) at pre-treatment examination and at follow-up after removal of amalgam fillings. Mercury concentration in both serum and urine was significantly reduced after amalgam removal (P < 0·001, and P = 0·004, respectively).
