[1] Orebro Univ Hosp, Dept Pediat, SE-70185 Orebro, Sweden
[2] Karolinska Univ Hosp, Dept Med, Clin Epidemiol Unit, Stockholm, Sweden
[3] Karolinska Inst, Stockholm, Sweden
[4] Univ Maryland, Sch Med, Mucosal Biol Res Ctr, Baltimore, MD 21201 USA
[5] Univ Maryland, Sch Med, Ctr Celiac Res, Baltimore, MD 21201 USA