central register administered by CDC that include:; approximate 
level of exposure or proximity to hazard, as well as the usual 
demographic information. 
(ii) A means of long-term follow-up should be established. 
(iii) Suitable outcome events should be established and 
monitored at periodic intervals. Special sample surveys should 
also be possible as knowledge increases. 
I appreciate the opportunity to comment on the proposed 
guidelines . 
Sincerely yours 
David Ozonoff, MD, MPH 
Public Health Program 
pad 
[A-252] 
