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"While spinal manipulation is an acceptable modality in the treatment of back pain, it is used inappropriately by some chiropractors who use manipulation as a treatment for disease by 'adjusting vertebral subluxations.' Defined by the subluxation theory that gave it birth, the core of the chiropractic profession continues to cling to a modified version of the theory, despite rejection by the scientific community. Philosophical differences between the various factions in chiropractic, ranging from some who have renounced subluxation theory to those who are subluxation-based, keep the profession divided and marginal." Samuel Homola DC, Focus on Alternative and Complementary Therapies [FACT] (June 2013)