[1] Brigham & Womens Hosp, Div Pharmacoepidemiol & Pharmacoecon, Dept Med, Boston, MA USA
[2] Karolinska Inst Campus Solna, Dept Med Epidemiol & Biostat, Stockholm, Sweden
[3] Leiden Univ, Med Ctr LUMC, Dept Clin Epidemiol, Leiden, Netherlands
[4] Tufts Med Ctr, Div Nephrol, Dept Internal Med, Boston, MA USA
[5] Chu Liege, Dept Nephrol Dialysis Transplantat, Luik, Belgium