M. A. Walker, Li, Y., Samson, C. O., Simpson, K. J., Foutz, T., and Brown, C. N.,
“Differences in trunk range of motion for various flexibility protocol types, particularly in quarterbacks wearing rib protectors”,
Sports Orthopaedics and Traumatology, vol. 37, no. 1, pp. 41 - 50, 2021.