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Nishijima, Y., Yamaguchi, M., Kojima, T., Aihara, N., Nakajima, R., & Kasai, K. (2006). Levels of RANKL and OPG in gingival crevicular fluid during orthodontic tooth movement and effect of compression force on releases from periodontal ligament cells in vitro. Orthodontics and Craniofacial Research, 9(2), 63–70. doi:10.1111/j.1601-6343.2006.00340.x 
10.1111/j.1601-6343.2006.00340.x