Two approaches to estimate population size of drug users in six prefectural cities of Guangdong Province
FU Xiao-bing, LI Yan, LUO Yu-lan, HUANG Hui-zhen, YU Guo-long, LIN Peng
S China J Prev Med . 2015, (2): 132 -135 .  DOI: 10.13217/j.scjpm.2015.0132

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