Analytical study designs--I.
Lobo
M A
MA
Department of Community Health Sciences, Aga Khan University, Karachi.
Qureshi
A F
AF
D015982:Bias; D016022:Case-Control Studies; D015986:Confounding Factors, Epidemiologic; D003627:Data Interpretation, Statistical; D006801:Humans; D016017:Odds Ratio; D012107:Research Design