id	keyword
ajeer-2199	heterogeneity
ajeer-2199	price
ajeer-2199	distance
ajeer-2199	healthcare
ajeer-2199	mnl
ajeer-2199	mmnl
ajeer-2199	income
ajeer-2199	choice
ajeer-2199	effect
ajeer-2199	demand
ajeer-2199	patients
ajeer-2199	journal