Summarized information of the studies included in meta-analysis.
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aAccording to the universally agreed standard(population size, GDP, et al.), china cities is divided into three categories, including level A cities (large cities), level B cities (medium-sized cities) and level C cities (small cities).
bgeographic areas refers to geographic location of china cities, including southern (S: southern) cities and northern (N: northern) cities.
cGP: General population; PP: Permanent population.
dNR: not reported in original paper; NA: not available.
创建时间：
2013-03-06
