[1] Karolinska Inst, Dept Gastroenterol & Hepatol, Stockholm, Sweden
[2] Karolinska Inst, Dept Med, Stockholm, Sweden
[3] Stockholm Cty Council, Publ Healthcare Serv Comm, Stockholm, Sweden
[4] Karolinska Inst, Stockholm Cty Council, Publ Healthcare Serv Comm, Ctr Pharmacoepidemiol,Dept Med, Stockholm, Sweden