2393-66062393-6606S2393-6606201800010000310.22235/ech.v7i1.1537Chile000620180006201871316CPE Puerto Rico198420071611129-352010161131-520122012146-641979242419817177694-7052001199611127-412014911201421186-9720052011XVIII3311-22200940-320166 ed.209-462701-1120121401154-63201212118-21200461414189-9620152322315-222004-20082667-7520071122325-3020021022137-4420076055546-5120101844598-6032010122255-92