TY - JOUR AU - Castiglione, G; Zappa, M; Grazzini, G TI - Screening for colorectal cancer by faecal occult blood test: comparison of immunochemical tests JO - J Med Screen VL - 7 PY - 2000 DO - 10.1136/jms.7.1.35 SP - 35 EP - 37 ER -