Prevalence of major depressive disorder and its socio-demographic correlates in the general adult population in Hebei province, China. - Zhang, Yun-Shu; Rao, Wen-Wang; Cui, Li-Jun; Li, Jian-Feng; Li, Lin; Ng, Chee H.; Ungvari, Gabor S.; Li, Ke-Qing; Xiang, Yu-Tao (Journal of Affective Disorders, 2019)