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Covariance estimators for generalized estimating equations (GEE) in longitudinal analysis with small samples

It is our belief that the right instrument can be truly inspirational

Its the tobacco companies fault theyre using these products. Local retailers, meanwhile, argue the majority of underage smokers get tobacco products from sources other than direct sales, including friends and family

Carbon Monoxide Carbon Monoxide is a poisonous gas which limits the amount of oxygen that the red blood cells in our bodies carry

Secondhand smoke exposure can also lead to lung cancer and heart disease

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