MT-CO1 and cyst: Demographic data of patients undergoing cystic echinococcosis surgery, histological features of the removed cyst, and molecular identification of Echinococcus granulosus in formalin-fixed paraffin embedded cyst tissue and serum by the cytochrome c oxidase I (cox1) and NADH dehydrogenase subunit I (nad1) mitochondrial genes.