Waihangahia he putanga matatini ake o tenei rerenga Ko nga pungarehu whakarewa kati kua whakawhanakehia mai i te 1956 e John C. Elliott i Bjorksten Research Laboratories.
Ko te tikanga, ko te putanga matatini ake o te rerenga ko "Kua whakawhanakehia nga pahuka whakarewa pūtau kati mai i te tau 1990, a he mea hanga noa ma te werohia o te hau, o te kaihoko pahuka ranei ki te whakarewa rewa. "