back pain disorders and exposure to whole- body vibration in the workplace. Semin Perinatol 20:38-53. BurkeIG, Watson RWG, McCormack D. Dowling FE, Walsh MG, Fitzpatrick 1M. 2002. Intervenebral discs which cause low back pain secrete high levels of proinflammatory mediators. J Bone Joint Surg 84-B:196-