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" ... Shahar and Sayers examined x-rays of 1,200 individuals aged 18 to 86 years old, who were all radiographed at the same chiropractic clinic; many of the people were therefore symptomatic for cervical spine (neck) pain. Using the x-rays, the researchers measured the external occipital protuberance (EOP), a bony projection in the back of the human skull that anchors the top of the nuchal ligament, which terminates at the spine of the last cervical vertebra. The areas where muscles, tendons, and ligaments attach to bone are called entheses, and researchers often see bone growth or reduction at these sites depending on growth or trauma. ... "