Dose-response association of sleep duration with anxiety symptoms in Chinese type 2 diabetes mellitus 1Department of Epidemiology and Statistics, Ningxia Medical College, Yinchuan, China 2The Center for Disease Control and Prevention of Yinchuan City, Yinchuan, China 3Department of Health Management Center, People’s Hospital of Ningxia Hui Autonomous Region, Yinchuan, China 4Department of Chinese Medicine, The Second People’s Hospital of Shizuishan, Shizuishan, China 5Department of...