Cov khoom uas pab tau cov pej xeem kom lawv noj qab haus huv. Raws li WHO hais, cov khoom no yuav tsum muaj "txhua lub sijhawm, kom txaus, thiab muaj cov tshuaj uas tsim nyog, thiab muaj cov ntaub ntawv zoo thiab tus nqi uas tus neeg thiab zej zog them taus."