Donald R Murphy1,2,3
, Michael J Schneider4,5
, David R Seaman6
, Stephen M Perle7
and Craig F Nelson8 
1
Rhode Island Spine Center Pawtucket, RI, USA
2
Department of Community Health, Warren Alpert Medical School of Brown University, Providence, RI, USA
3
Department of Research, New York Chiropractic College, Seneca Falls, NY, USA
4
Private practice of chiropractic, Pittsburgh, PA, USA
5
School of Health and Rehabilitation Sciences, University of Pittsburgh, Pittsburgh, PA, USA
6
Palmer College of Chiropractic, Florida Port Orange, FL, USA
7
University of Bridgeport College of Chiropractic, Bridgeport, CT, USA
8
American Specialty Health, San Diego, CA, USA