Changes in pressure pain thresholds over C5-C6 zygapophyseal joint after a cervicothoracic junction manipulation in healthy subjects - Fernandez-De-Las-Penas, Cesar; Alonso-Blanco, Cristina; Cleland, Joshua A; Rodriguez-Blanco, Cleofas; Alburquerque-Sendin, Francisco (Dynamic chiropractic, 2008)