From *Spine Specialists, Tyler, Texas, †Department of Rehabilitation Medicine, University of Texas Health Science Center, San Antonio, Texas, ‡Michaelsen Chiropractic Center, Tyler, Texas, §Department of Epidemiology/Biomathematics, University of Texas Health Center, Tyler, Texas, and ∥Faculty of Medicine and Health Sciences, University of Newcastle, Newcastle, Australia.
Acknowledgment date: December 1, 1995.
First revision date: May 10, 1996.
Acceptance date: May 10, 1996.
Device status category: 1.
Address reprint request to: Paul Dreyfuss, MD; 701 Olympic Plaza, 2nd Floor; Tyler, Texas 75701