[1] Duke Univ, Med Ctr, Dept Med, Durham, NC 27710 USA
[2] Duke Univ, Med Ctr, Ctr Human Genet, Durham, NC 27710 USA
[3] Duke Univ, Med Ctr, Dept Pediat, Durham, NC 27710 USA
[4] Beaumont Hosp, Dept Nephrol, Dublin, Ireland
[5] Christchurch Hosp, Dept Nephrol, Christchurch, New Zealand
[6] Duke Univ, Med Ctr, Dept Pathol, Durham, NC 27710 USA
[7] Durham VA Med Ctr, Durham, NC 27710 USA