id	keyword
american_scientific_journal-633	khat
american_scientific_journal-633	chewing
american_scientific_journal-633	effects
american_scientific_journal-633	journal
american_scientific_journal-633	leaves
american_scientific_journal-633	cathinone
american_scientific_journal-633	edulis
american_scientific_journal-633	khat chewing
american_scientific_journal-633	use
american_scientific_journal-633	catha
american_scientific_journal-633	ethiopia
american_scientific_journal-633	system
american_scientific_journal-633	sciences
american_scientific_journal-633	health
american_scientific_journal-633	research
american_scientific_journal-633	scientific