I mahi tahi ngā kairangahau o Amerika me Brazil i tētahi arotake i te tau 2016, i whakaurua ai he 46 ngā rangahau mō te whakamahinga o te rama whakaora mō te mahi hākinakina a ngā kaitākaro.
Ko tētahi o ngā kairangahau ko Tākuta Michael Hamblin o Te Whare Wānanga o Harvard, kua roa nei ia e rangahau ana i te rama whero.
I whakatauhia e te rangahau ka taea e ngā maimoatanga mārama whero me te tata-whero te whakanui ake i te papatipu uaua me te whakaiti i te mumura me te ahotea waikura.
"Ka ara ake te pātai mēnā me whakaaetia te PBM i roto i ngā whakataetae hākinakina e ngā mana whakahaere o te ao."