Published: Oct 04, 2012 6:51 AM EDT

BATON ROUGE, La. (AP) - The National Institute of Environmental Health Sciences is making another push to get people who worked on the BP/Deepwater Horizon oil disaster cleanup to enroll in a long-term health study.
 
Dr. Dale Sandler, chief of the agency's epidemiology branch, said Tuesday that more than 29,000 people have enrolled so far. But, she says, the goal is to get 35,000 to 40,000 people signed up before enrollment in the study ends Dec. 31.
 
The Advocate reports enrollment started March 2011.
 
The study looks at how the oil leak cleanup work affects the physical and mental health of people who participated.
 
People interested in participating can call toll-free 855-644-4853 or visit the study's website at http://www.gulfstudy.nih.gov