WARRENVILLE, S.C. (AP) -- Researchers studying the health effects from a devastating South Carolina train wreck and chlorine gas release are seeking more participants.

The Aiken Standard reports ( ) that Dr. Erik Svendsen on Wednesday said he'd like several hundred people who used to work for Avondale Mills to participate in his Graniteville Recovery and Chlorine Epidemiology Study.

On Jan. 6, 2005, a Norfolk Southern train car carrying chlorine derailed and ruptured, releasing a cloud of the poisonous gas over Graniteville. Nine people died. Scores of others have needed hospitalization or treatment as a result of the gas.

Study participants receive pulmonary diagnostic tests at no cost. The study is sponsored by the National Institute of Environmental Health Sciences.

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