8Wang J, Zhang L, Wang F, et al. Prevalence, awareness, treat- ment, and control of hypertension in China : results from a national survey [J]. Am J Hypertens, 2014, 27(11) : 1355-1361.
9Quan H, Sundararajan V, Halfon P, et al. Coding algorithms for defining Comorbidities in ICD-9-CM and ICD-10 administrative da- ta [J]. MedCare, 2005,43(11): 1130 -1139.
10Cai L, Shu ZK, Dong J, et al. The economic burden of hyperten- sion in rural south-west China [ J]. Trop Med Int Health, 2012, 17(12) : 1544 -1551.