Joseph C Keating Jr1
, Keith H Charlton2
, Jaroslaw P Grod3
, Stephen M Perle4
, David Sikorski5
and James F Winterstein6 
16135 North Central Avenue, Phoenix, AZ, 85012, USA
2School of Medicine, Mayne Medical School, University of Queensland, Herston, Queensland 4006, Australia
3Department of Graduate Education and Research, Canadian Memorial Chiropractic College, 6100 Leslie Street, Toronto ON, M2H 3J1, Canada
4Department of Clinical Sciences, College of Chiropractic, University of Bridgeport, 225 Myrtle Ave., Bridgeport, CT 06604, USA
5Department of Chiropractic Procedures, Southern California University of Health Sciences, 16200 E. Amber Valley Drive, Whittier, CA 90604, USA
6President, National University of Health Sciences, 200 East Roosevelt Road, Lombard, IL 60148, USA