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Kamper, Steven J., Logan, Gabrielle, Copsey, Bethan, Thompson, Jacqueline, Machado, Gustavo C., Abdel-Shaheed, Christina, Williams, Christopher M., Maher, Christopher G., Hall, Amanda M.. Lippincott Williams & Wilkins; 2020. What is usual care for low back pain? A systematic review of health care provided to patients with low back pain in family practice and emergency departments.