Fig. 1

Flow diagram of the study participants. A total of 28,990 subjects were enrolled in 2006, and 6779 subjects (male/female: 4454/2325) were finally recruited for analyses in the present study

Flow diagram of the study participants. A total of 28,990 subjects were enrolled in 2006, and 6779 subjects (male/female: 4454/2325) were finally recruited for analyses in the present study