Busse Jason W, Guyatt Gordon H, Bhandari Mohit, Cassidy J David
McMaster Health Sciences, Center, Department of Epidemiology and Biostatistics, Hamilton, Ontario, Canada.
J Manipulative Physiol Ther. 2003 Oct;26(8):525-32. doi: 10.1016/S0161-4754(03)00109-X.