RT Journal Article SR Electronic T1 Acute onset of knee pain JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 744 OP 746 VO 68 IS 9 A2 Williams, Marc A1 Schils, Jean A1 Kline, Mitchell YR 2001 UL http://www.ccjm.org/content/68/9/744.abstract AB