[1] British Columbia Childrens Hosp, Vancouver, BC V6H 3V4, Canada
[2] Ctr Children & Adolescent Med, Heidelberg, Germany
[3] Med Univ Gdansk, Gdansk, Poland
[4] Hosp Ninos Sor Maria Ludovica, La Plata, Buenos Aires, Argentina
[5] Hosp Pediat Humberto Notti, Mendoza, Argentina
[6] Inst Nacl Rinon, Bogota, Colombia
[7] Driscoll Childrens Hosp, Corpus Christi, TX USA
[8] Hosp Interzonal Gen, Unidad Nefrol Pediat, Bahia Blanca, Buenos Aires, Argentina
[9] Childrens Hosp Philadelphia, Philadelphia, PA 19104 USA
[10] Childrens Dialysis Ctr, Strasbourg, France
[11] Seattle Childrens Hosp, Seattle, WA USA
[12] Hannover Med Sch, D-30623 Hannover, Germany
[13] Hosp Ninos Dr Ricardo Gutierrez, Buenos Aires, DF, Argentina
[14] Aristoteles Univ, Pediat Nephrol Unit, Thessaloniki, Greece
[15] Starship Childrens Hosp, Auckland, New Zealand
[16] UCLA Med Ctr, Los Angeles, CA USA
[17] Childrens Mercy Hosp, Kansas City, KS USA