[1] Univ Otago Christchurch, Dept Med, Christchurch 8140, New Zealand
[2] Cochrane Renal Grp, Sydney, NSW, Australia
[3] Univ Sydney, Sydney Sch Publ Hlth, Sydney, NSW 2006, Australia
[4] Amedeo Avogadro Univ Eastern Piedmont, Novara, Italy
[5] Fdn Mario Negri Sud, Santa Maria Imbaro, Italy
[6] Diaverum, Lund, Sweden