[1] Leiden Univ, Dept Clin Epidemiol, Med Ctr, Leiden, Netherlands
[2] Dutch Kidney Patients Assoc, Bussum, Netherlands
[3] Leiden Univ, Dept Nephrol, Med Ctr, Leiden, Netherlands
[4] St Antonius Hosp, Dept Internal Med, Nieuwegein, Netherlands
[5] Univ Amsterdam, Dept Nephrol, Med Ctr, Amsterdam, Netherlands
[6] Nefrovisie Fdn, Utrecht, Netherlands
[7] Canisius Wilhelmina Hosp, Dept Internal Med, Nijmegen, Netherlands
[8] Maastricht Univ, Dept Internal Med, Med Ctr, Maastricht, Netherlands