JIA affected sibling pairs present high correlation for ANA and ILAR category by Alessio M, Lepore L, Calcagno G, Trauzeddel R, Falcini F, Cortis E, Alpigiani MG, Rumba I, Dressler F, Balogh Z, Zulian F, Pruunsild C, Herlin T, Nielsen S, Stanevicha V, Foeldvari I, Malattia C, Filocamo G, Glass DN, Thompson SD, Martini A, Ruperto N