A Follow-up Study on Renal Tubular Dysfunction in Women Living in the Cadmium-polluted Jinzu River Basin in Toyama, Japan : Part 1. Changes in the level of exposure to cadmium after soil replacement of polluted paddy fields and the related effects on the prognosis of renal tubular dysfunction(Abustracts from JAPANESE JOURNAL OF HYGIENE (NIHON EISEIGAKU ZASSHI)Vol.53 No.3)