[1] Finnish Registry Kidney Dis, Helsinki, Finland
[2] Helsinki Univ Hosp, Abdominal Ctr Nephrol, Helsinki, Finland
[3] Kuopio Univ Hosp, Ctr Med, Kuopio, Finland
[4] Natl Inst Hlth & Welf, Dept Hlth & Social Care Syst, Helsinki, Finland
[5] Univ Helsinki, Dept Social Res, Helsinki, Finland