Qi Chen, MD a, Yan Tang, MD a, Ji Li, MD, PhD a, b, c, d, e, ⁎ 
a Department of Dermatology, Xiangya Hospital, Central South University, Changsha, Hunan, China
b Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Central South University, Changsha, Hunan, China
c Key Laboratory of Molecular Radiation Oncology Hunan Province, Changsha, Hunan, China
d National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China
e Department of Dermatology, The Second Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang, China