Flynn T, Fritz J, Whitman J, Wainner R, et. al., A clinical prediction rule for classifying patients with low back pain who demonstrate short-term improvement with spinal manipulation, Spine, 2002 Dec 15;27(24):2835-43

Childs JD, Fritz JM, Flynn TW, et. al., A clinical prediction rule to identify patients with low back pain most likely to benefit from spinal manipulation: a validation study, Ann Intern Med, 2004 Dec 21;141(12):920-8