TI - Can a city population represent a whole country? Essentials of study design for epidemiologic studies/Serum lipid profiles including non-high density lipoprotein cholesterol levels in Turkish school-children AU - Yokuşoğlu, M. AU - Uzun, M. AU - Baysan, O. SO - The Anatolian Journal of Cardiology 2008;8:174-175. DO -