Letter: Psoriatic arthritis in a child with Down's syndrome.
D001168:Arthritis / Q000150:complications*; D002675:Child, Preschool; D002904:Chromosomes, Human, 21-22 and Y; D004314:Down Syndrome / Q000150:complications*; D006801:Humans; D008297:Male; D011565:Psoriasis / Q000150:complications*; D014314:Trisomy