TY - GEN AU - Kononen,D W TI - First-year changes in blood lead and zinc protoporphyrin levels within two groups of occupational lead workers SN - 0002-8894 PY - 1991///0813 KW - Adult KW - Chemical Industry KW - Humans KW - Lead KW - blood KW - Male KW - Middle Aged KW - Monitoring, Physiologic KW - Occupational Exposure KW - Protoporphyrins KW - Time Factors N1 - Publication Type: Journal Article UR - https://doi.org/10.1080/15298669191364541 ER -