<style face="normal" font="default" size="100%">Prevalence and risk factors of soil-transmitted helminthiasis among school children living in an agricultural area of North Sumatera, Indonesia.</style>

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0<style face="normal" font="default" size="100%">Prevalence and risk factors of soil-transmitted helminthiasis among school children living in an agricultural area of North Sumatera, Indonesia.</style><style face="normal" font="default" size="100%">Prevalence and risk factors of soil-transmitted helminthiasis among school children living in an agricultural area of North Sumatera, Indonesia.</style>