<prompt> Translate the following text to SwahiliIn order to investigate the impact of using the CV based WTP estimates, the Alternative Estimate relies on a value for incidence of chronic bronchitis using a cost-of-illness estimate based Cropper and Krupnick 1990 which calculates the present value of the lifetime expected costs associated with the illness.  <response>: Kwa mfano, kwa ajili ya utafiti wa matokeo ya matumizi ya CV-msingi WTP makadirio, makadirio mbadala hutegemea thamani kwa ajili ya matukio ya bronchitis ya muda mrefu kwa kutumia gharama ya ugonjwa makadirio kulingana na Cropper na Krupnick 1990 ambayo mahesabu thamani ya sasa ya maisha ya gharama zinazotarajiwa kuhusishwa na ugonjwa. 