... N:Efficacy of preventive spinal manipulation for chronic low- back pain and related disabilities: A preliminary study. JManipulative Physiol Ther 2004, 27:50 9-5 14.4. Axén I, Rosenbaum A, Eklund A, ... careare unclear, as indicated by two literature reviews con-ducted over the past ten years [1,2]. Furthermore, it is notknown if maintenance care has any advantages above thecall-when-you-need ... The Nordic Maintenance Care Program, are presently conducting a number of studies in this area and as an initial step, itbecame necessary to identify chiropractors' use of mainte-nance care....