RT Journal Article SR Electronic T1 Recent alveolar echinococcosis cases in North America warrant further investigation JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E1338 OP E1338 DO 10.1503/cmaj.73510 VO 191 IS 48 A1 Alessandro Massolo YR 2019 UL http://www.cmaj.ca/content/191/48/E1338.abstract