Joseph C Keating Jr1
, Keith H Charlton2
, Jaroslaw P Grod3
, Stephen M Perle4
, David Sikorski5
and James F Winterstein6 
1
6135 North Central Avenue, Phoenix, AZ, 85012, USA
2
School of Medicine, Mayne Medical School, University of Queensland, Herston, Queensland 4006, Australia
3
Department of Graduate Education and Research, Canadian Memorial Chiropractic College, 6100 Leslie Street, Toronto ON, M2H 3J1, Canada
4
Department of Clinical Sciences, College of Chiropractic, University of Bridgeport, 225 Myrtle Ave., Bridgeport, CT 06604, USA
5
Department of Chiropractic Procedures, Southern California University of Health Sciences, 16200 E. Amber Valley Drive, Whittier, CA 90604, USA
6
President, National University of Health Sciences, 200 East Roosevelt Road, Lombard, IL 60148, USA