Validity and reliability.
Kadir
M M
MM
Department of Community Health Sciences, Aga Khan University, Karachi.
Qureshi
A F
AF
D015982:Bias; D015986:Confounding Factors, Epidemiologic; D006801:Humans; D015588:Observer Variation; D015203:Reproducibility of Results; D012106:Research / Q000706:statistics & numerical data*; D012107:Research Design