Association between internet usage and healthcare expenditure among middle-aged and older Chinese adults with chronic diseases: the role of self-rated health | BMC Public Health
Data and study sample The study participants were selected from the CFPS, a large-scale, nationwide and continuous social tracking survey project conducted every two years by the China Social Science Survey Center of Peking University. The survey uses a stratified sampling method with unequal probabilities at five levels, namely, provinces and cities, districts and counties, … Read more
