About the Authors

Zhigang Hu

Affiliations Geriatric Research, Education and Clinical Center, VA Palo Alto Health Care System, Palo Alto, California, United States of America, Division of Endocrinology, Stanford University, Stanford, California, United States of America

Wen-Jun Shen

Affiliations Geriatric Research, Education and Clinical Center, VA Palo Alto Health Care System, Palo Alto, California, United States of America, Division of Endocrinology, Stanford University, Stanford, California, United States of America

Yuan Cortez

Affiliation Geriatric Research, Education and Clinical Center, VA Palo Alto Health Care System, Palo Alto, California, United States of America

Xudong Tang

Affiliations Geriatric Research, Education and Clinical Center, VA Palo Alto Health Care System, Palo Alto, California, United States of America, Division of Endocrinology, Stanford University, Stanford, California, United States of America

Li-Fen Liu

Affiliations Geriatric Research, Education and Clinical Center, VA Palo Alto Health Care System, Palo Alto, California, United States of America, Division of Endocrinology, Stanford University, Stanford, California, United States of America

Fredric B. Kraemer

Affiliations Geriatric Research, Education and Clinical Center, VA Palo Alto Health Care System, Palo Alto, California, United States of America, Division of Endocrinology, Stanford University, Stanford, California, United States of America

Salman Azhar

salman.azhar@va.gov

Affiliations Geriatric Research, Education and Clinical Center, VA Palo Alto Health Care System, Palo Alto, California, United States of America, Division of Gastroenterology and Hepatology, Stanford University, Stanford, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ZH WJS FBK SA. Performed the experiments: ZH YC. Analyzed the data: ZH XT LFL. Wrote the paper: ZH SA. Edited the manuscript: ZH WJS FBK SA.