Department of Clinical Research;
The First Affiliated Hospital of Jinan University;
Guangzhou 510630;
China;
School of Public Health;
Xi’an Jiaotong University Health Science Center;
Xi’an 710061;
China;
Department of Human Anatomy;
Histology and Embryology;
School of Basic Medical Sciences;
Xian Jiaotong University Health Science Center;
Xi’an 710061;
China.;
Sleep duration; Overweight/obesity; Longitudinal study; China Health and Nutrition Survey;