7Donner A. An empirical study of cluster randomization [J]. Int J Epidemiol, 1982,11 (3) : 283-286.
8Landis JR, Koch GG. The measurement of observer agreement for categorical data [ J ]. Biometrics, 1977,33 ( 1 ) : 159-174.
9Park HS, Park JY, Cho SI. Familial aggregation of the metabolic syndrome in Korean families with adolescents [ J ]. Atherosclerosis, 2006,186( 1 ) :215-221.
10Lee KE, Klein BE, Klein R. Familial aggregation of components of the multiple metabolic syndrome in the Framingham Heart and Offspring Cohorts:Genetic Analysis Workshop Problem 1 [J]. BMC Genet, 2003,4(Suppl 1 ):S94.
