This sub-study http://www.ncbi.nlm.nih.gov/projects/gap/cgi-bin/study.cgi?study_id=phs000650CKiD contains genotype and selected phenotype of subjects available from the http://www.ncbi.nlm.nih.gov/projects/gap/cgi-bin/study.cgi?study_id=phs000650study. Summary level phenotypes for the NIDDK PediGFR_v2 Cohort study participants can be viewed at the top-level study page http://www.ncbi.nlm.nih.gov/projects/gap/cgi-bin/study.cgi?study_id=phs000842PediGFR_v2 Cohort. Individual level phenotype data and molecular data for all PediGFR_v2 Cohort top-level study and sub-study are available by requesting Authorized Access to the NIDDK PediGFR_v2 Cohort http://www.ncbi.nlm.nih.gov/projects/gap/cgi-bin/study.cgi?study_id=phs000842study. The Pediatric Investigation for Genetic Factors Associated with Renal Progression (PediGFR) (RO1-DK082394) is an international collaborative study among three large prospective cohort studies of children with chronic kidney disease... (for more see dbGaP study page.)