 Waa halis in carruurta ay sariir kula seexdaan qof qaangaar ah Sida ka muuqata dhammaan cilmi-baarisyada meel kasta laga sameeyay, halka arrin ee ka soo baxay wuxuu yahay: Marka canug uu sariir kula seexdo qof weyn, in 20 illaa 60 jeer ay sare u qaadeyso halista ah in canuggaas uu dhinto. 