ʻO nā huahana e lawelawe ana i nā pono olakino o ka lehulehu. Wahi a WHO, pono e loaʻa kēia mau huahana "i nā manawa a pau, ma nā nui kūpono, ma nā ʻano lāʻau kūpono, me ka maikaʻi i hōʻoia ʻia a me ka ʻike kūpono, a ma ke kumukūʻai hiki i ke kanaka a me ke kaiāulu ke kūʻai".