Learn More
BACKGROUND Second hand smoke (SHS) exposure is a severe public health problem, especially in low and middle countries, but no studies have examined both individual and city-level variables influencing exposure. METHODS A cross-sectional multistage sampling design was used to survey subjects from 21 cities in China. Using a standardized questionnaire(More)
Graph data has become increasingly prevalent in data-mining and data analysis generally. Many types of data can be represented naturally as graphs including social network data, log traversal, and online discussions. Moreover recent work on the importance of social relationships, peer tutoring, collaboration, and argumentation has highlighted the importance(More)
  • 1