बुहुमनाङै, हादोर निफ्राय हादोरसिम इसे सोलाय-सोल जों बोसोरफ्रोमबो मोनफ्रोम100,000 सुबुंअनजिमायाव बेयो मोनै एबा मोनथाम जाथायफोरनि हाराव सोमजियो।
Globally, it occurs at the rate of two or three cases per 100,000 populations per year with little variation from country to country.