"David A. Kessler, MD". BIO (Annual International Convention) 2004 Newsroom. 2004-06-14. Archived from the original on 2007-09-27. Retrieved 2007-12-16.
"David A. Kessler, MD". BIO (Annual International Convention) 2004 Newsroom. 2004-06-14. Archived from the original on 2007-09-27. Retrieved 2007-12-16.