PMC:7029449 / 12262-12343 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7029449","sourcedb":"PMC","sourceid":"7029449","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7029449","text":"Transmission studies in households and other closed settings; serological studies","tracks":[]}