Serum levels of 25-hydroxyvitamin D in children with tic disorders
LI Hong-Hua, WANG Bing, SHAN Ling, WANG Cheng-Xin, JIA Fei-Yong
CJCP . 2017, (11): 1165 -1168 .  DOI: 10.7499/j.issn.1008-8830.2017.11.008