In the above article [Reference Liu, Luan, Yin, Zhu and Lü1] the corresponding author details in the note on page 1 are incorrect. The correct details are given below. The authors apologize for this error.
Author for correspondence: Mr R. S. Luan, West China School of Public Health, Sichuan University, No. 16 Third Section of People South Road, Chengdu, Sichuan, People's Republic of China, 610041. (Email: luan_rs@scu.edu.cn)