id	keyword
american_scientific_journal-520	rubella
american_scientific_journal-520	hbv
american_scientific_journal-520	infection
american_scientific_journal-520	hepatitis
american_scientific_journal-520	hbsag
american_scientific_journal-520	prevalence
american_scientific_journal-520	women
american_scientific_journal-520	nigeria
american_scientific_journal-520	virus
american_scientific_journal-520	sero
american_scientific_journal-520	chronic
american_scientific_journal-520	journal
american_scientific_journal-520	study
american_scientific_journal-520	age
american_scientific_journal-520	research
american_scientific_journal-520	sciences