机构:
Orebro Univ Hosp, Dept Pediat, Orebro, Sweden
Karolinska Univ Hosp, Dept Med, Clin Epidemiol Unit, Stockholm, Sweden
Mayo Clin, Div Gastroenterol & Hepatol, Dept Med, Rochester, MN USA
Karolinska Inst, Stockholm, SwedenOrebro Univ Hosp, Dept Pediat, Orebro, Sweden