2MARK S. LITWIN,MARY McNAUGHTON-COLLINS,FLOYD J. FOWLER,J. CURTIS NICKEL,ELIZABETH A. CALHOUN,MICHEL A. PONTARI,RICHARD B. ALEXANDER,JOHN T. FARRAR,MICHAEL P. O’LEARY.THE NATIONAL INSTITUTES OF HEALTH CHRONIC PROSTATITIS SYMPTOM INDEX: DEVELOPMENT AND VALIDATION OF A NEW OUTCOME MEASURE[J]. The Journal of Urology . 1999 (2)