PMC:7105881 / 5312-5366
Annnotations
2_test
{"project":"2_test","denotations":[{"id":"32265848-27873511-36510970","span":{"begin":9,"end":13},"obj":"27873511"},{"id":"32265848-28277821-30941429","span":{"begin":9,"end":13},"obj":"28277821"}],"text":" et al., 2017). In the serological surveillance on hea"}