[Bias and confounding in the epidemiologic studies].
Ren
Tao
T
Department of Epidemiology and Health Statistics, College of Public Health, Beijing University, Beijing 100083, China
Zhan
Si-ting
ST
Shen
Xia
X
Meng
Fan-ya
FY
Hu
Yong-hua
YH
Li
Li-ming
LM
D015982:Bias; D015986:Confounding Factors, Epidemiologic; D004812:Epidemiologic Methods; D006801:Humans