[1] Greys Hosp, Renal Unit, Pietermaritzburg, South Africa
[2] Royal Devon & Exeter Hosp, Renal Unit, Exeter EX2 5DW, Devon, England
[3] Royal Devon & Exeter Hosp, Intens Care Unit, Exeter EX2 5DW, Devon, England
[4] Univ Khartoum, Soba Univ Hosp, Pediat Nephrol Unit, Khartoum, Sudan
[5] Pondicherry Inst Med Sci, Madras, Tamil Nadu, India
[6] Madras Med Mission, Madras, Tamil Nadu, India
[7] Botucatu Sch Med, Dept Med, Sao Paulo, Brazil
[8] Univ Calif San Diego, Div Nephrol Hypertens, San Diego, CA 92103 USA
[9] Shaare Zedek Med Ctr, Div Pediat Nephrol, Jerusalem, Israel
[10] Univ Sao Paulo, Sch Med, Pediat Nephrol Unit, Inst Crianca,Hosp Clin, Sao Paulo, Brazil
[11] Univ Cape Town, Red Cross War Mem Childrens Hosp, Pediat Nephrol Dept, ZA-7925 Cape Town, South Africa
[12] Univ Cape Town, Red Cross War Mem Childrens Hosp, Dept Surg, ZA-7925 Cape Town, South Africa
[13] Pontificia Univ Catolica Parana, Sch Med, Curitiba, Parana, Brazil
[14] Univ Missouri, Kansas City Sch Med, Div Pediat Nephrol, Kansas City, MO USA
[15] Queens Univ, Div Nephrol, Kingston, ON, Canada
[16] Yale Univ, New Haven, CT USA