21.   Certainly, more long-term studies are needed.

22.   Dina Vizzaccaro, lobbyist for the American Automobile Manufacturers Association, said the health effects of smog and dust need more study before current rules are changed.

23.   Dr. Joanne Jordan, an arthritis specialist at the University of North Carolina at Chapel Hill, who presented the findings, said much more study is needed.

24.   Dr. Tallal agreed and said that more studies were needed.

25.   Foster replied that the study was based on a small sample and that a broader study was needed.

26.   Groups worried that vaccines cause such problems, however, said more study was needed.

27.   He argued that the study was preliminary and that further studies would be needed.

28.   He acknowledged global warming is a problem but said more study is needed.

29.   He said the nation needs further study to establish a consensus about what is necessary and appropriate.

30.   He said it was too early to recommend lidocaine nose drops for treating migraines because larger studies were needed.