About the Authors

Renata C. Pereira

Affiliation Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America

Harald Jüppner

Affiliation Endocrine Unit and Pediatric Nephrology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, United States of America

Barbara Gales

Affiliation Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America

Isidro B. Salusky

Affiliation Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America

Katherine Wesseling-Perry

kwesseling@mednet.ucla.edu

Affiliation Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America

Competing Interests

Dr. Harald Jüppner is an author of the patent for the FGF23 immunoassay. The title of the patent is: “Immunoassays, assay methods, antibodies and method of creating antibodies for detecting FGF-23”. The patent number is: 7094551. This patent in no way alters the authors' adherence to all PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: RCP KWP IBS HJ. Performed the experiments: RCP BG. Analyzed the data: RCP KWP HJ. Contributed reagents/materials/analysis tools: IBS. Wrote the paper: KWP HJ IBS.