About the Authors
- Emma K. Larkin
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* E-mail: Emma.Larkin@Vanderbilt.edu
Affiliation Division of Allergy, Pulmonary and Critical Care, Department of Medicine, Vanderbilt University, Nashville, Tennessee, United States of America
- Tebeb Gebretsadik
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Affiliation Department of Biostatistics, Vanderbilt University, Nashville, Tennessee, United States of America
- Nathan Koestner
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Affiliation Division of Allergy, Pulmonary and Critical Care, Department of Medicine, Vanderbilt University, Nashville, Tennessee, United States of America
- Mark S. Newman
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Affiliation ZRT Laboratory, Beaverton, Oregon, United States of America
- Zhouwen Liu
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Affiliation Department of Biostatistics, Vanderbilt University, Nashville, Tennessee, United States of America
- Kecia N. Carroll
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Affiliation Department of Pediatrics, Vanderbilt University, Nashville, Tennessee, United States of America
- Patricia Minton
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Affiliation Division of Allergy, Pulmonary and Critical Care, Department of Medicine, Vanderbilt University, Nashville, Tennessee, United States of America
- Kim Woodward
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Affiliation Division of Allergy, Pulmonary and Critical Care, Department of Medicine, Vanderbilt University, Nashville, Tennessee, United States of America
- Tina V. Hartert
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Affiliation Division of Allergy, Pulmonary and Critical Care, Department of Medicine, Vanderbilt University, Nashville, Tennessee, United States of America
Competing Interests
Mark S. Newman is an employee of ZRT Laboratory, which sells Vitamin D testing. He conducted the vitamin D assay and prepared the protocol section of the manuscript, describing the LC/MS/MS method. The authors paid a fee to ZRT Laboratory for their service. ZRT Laboratory did not have any say in the data analysis or interpretation of the results. They did not have any input into the decision to publish. Mark Newman prepared the assay specifications. This does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials.
Author Contributions
Conceived and designed the experiments: TVH. Performed the experiments: MSN. Analyzed the data: EKL TG. Wrote the paper: EKL MSN NK. Interpretation of data and critical review of manuscript: KNC PM KW. Data Manager: ZL.