Fecal occult blood: a comparison of chemical and immunochemical tests - Borges, Luana Vilarinho; Carrilho, Flair José; Hashimoto, Cláudio Lyoiti; Silva, Ana Luiza Werneck da; Silva, Joyce Matie Kinoshita da; Mattar, Rejane (Arquivos de gastroenterologia, 2018)