PMC:2917556 / 5895-6385 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/2917556","sourcedb":"PMC","sourceid":"2917556","source_url":"https://www.ncbi.nlm.nih.gov/pmc/2917556","text":"Source populations\nFor our purpose, we have included only studies performed on the whole population or a representative sample of the whole population within a certain age range in a community, town or country. We have accordingly not included studies based on selected populations (clinic based, in workplaces, among university students, etc.). Since the primary school is obligatory in all European countries, studies on headache in children and youth based on schools have been included.","divisions":[{"label":"title","span":{"begin":0,"end":18}}],"tracks":[]}