Zhonghua Liu Xing Bing Xue Za Zhi
October 2003
Objective: To observe blood lead level and related risk factors among children of 0 - 6-year old in Beijing.
Methods: Stratified-clustered-random sampling and simple random sampling were used. A total of 2 262 children of 0 - 6 years old were investigated from May to July 2001.