EGFR and chronic cystitis: Healthy volunteers: 0/30 (EGFR), 0/30 (UP II), 6/30 (CK-19), 4/30 (CK-20); cystitis patients: 0/9 (EGFR), 3/9 (UP II), 3/9 (CK-19), 2/9 (CK-20)