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The contents of this site are for informational purposes only. No content is intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a physician or other qualified health care professional with any questions you may have regarding any medical condition. Never disregard or delay in seeking medical advice based upon something that you have read on this site. If you think you may have a medical emergency, call 911 or a qualified health care professional. Reliance on any information provided on this site is solely at your own risk.

This website was supported by the Association of Occupational and Environmental Clinics (AOEC) and funded (in part) by the cooperative agreement award number 1U61TS000118-03 from the Agency for Toxic Substances and Disease Registry (ATSDR).

Acknowledgement: The U.S. Environmental Protection Agency (EPA) supports the PEHSU by providing funds to ATSDR under Inter-Agency Agreement number DW-75-92301301-0. Neither EPA nor ATSDR endorse the purchase of any commercial products or services mentioned in PEHSU publications.