IL12B and alopecia areata: IL2RA polymorphism mutation variant mutation OR variant OR polymorphism “ Alopecia Areata’’IL17A polymorphism mutation variant mutation OR variant OR polymorphism “ Alopecia Areata’’IL12B polymorphism mutation variant mutation OR variant OR polymorphism “ Alopecia Areata’’IL23R polymorphism mutation variant mutation OR variant OR polymorphism “ Alopecia Areata’’