[1] Trigen, London, England
[2] Royal Devon & Exeter Hosp, Exeter Kidney Unit, Exeter EX2 5DW, Devon, England
[3] Bialystok Med Univ, Bialystok, Poland
[4] Univ Glasgow, Western Infirm, Glasgow G11 6NT, Lanark, Scotland
[5] Birmingham Heartlands Hosp, Glaxo Renal Unit, Birmingham B9 5ST, W Midlands, England
[6] Fdn S Maugeri, Pavia, Italy
[7] St James Univ Hosp, Leeds LS9 7TF, W Yorkshire, England
[8] Premier Res, Crowthorne, Berks, England