[1] Kings Coll Hosp London, Dept Renal Med, London, England
[2] Kantonsspital, Dept Nephrol, Aarau, Switzerland
[3] Eurodial, Dialysis Unit, Leiria, Portugal
[4] Univ Erlangen Nurnberg, Dept Nephrol, D-91054 Erlangen, Germany
[5] Univ Groningen, Dept Nephrol, Groningen, Netherlands
[6] Davita Healthcare Partners, Clin Support Serv, Denver, CO USA
[7] Vifor Pharma Ltd, Dept Med, Glattbrugg, Switzerland
[8] Dept Nephrol, Renal Res, Gosford, Australia