PMC:4137988 / 43072-43188 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/4137988","sourcedb":"PMC","sourceid":"4137988","source_url":"https://www.ncbi.nlm.nih.gov/pmc/4137988","text":"n=14,700: 6–7-year age group, 6.5±0.5 years, 49% girls; 13–14-year group, 13.5±0.5 years; 51% girls; cross-sectional","tracks":[]}