Eisenlohr-Moul, T., Crofford, L., Howard, T., Yepes, J., Carlson, C., & de Leeuw, R. (2015). Parasympathetic reactivity in fibromyalgia and temporomandibular disorder: associations with sleep problems, symptom severity, and functional impairment. The Journal of Pain, 16(3), 247-57. https://doi.org/10.1016/j.jpain.2014.12.005