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2. Myofascial pain syndrome of the head and neck: a review of clinical characteristics of 164 patients;Fricton;Oral Surg Oral Med Oral Pathol,1985
3. Myofascial trigger points: clinical view;Travell,1976
4. Myofascial (trigger point pain) injection: theory and treatment;Cifala;Osteopath Med,1979
5. Trigger point injection: its place in physical medicine and rehabilitation;Cooper;Arch Phys Med,1961