TI - MEchanical therapeutic agencies.the salt of the earth. PT - JOUR DP - 2002 TA - JAMA pages = {1920}, VI - 288 IP - 15 AID - 10.1001/jama.288.15.1920 [doi] 4100 - http://dx.doi.org/10.1001/jama.288.15.1920 SO - JAMA October 16, 2002 288(15):1920