Drupal-Bibcite0<style face="normal" font="default" size="100%">Cost-effectiveness of scaling up mass drug administration for the control of soil-transmitted helminths: a comparison of cost function and constant costs analyses.</style><style face="normal" font="default" size="100%">Cost-effectiveness of scaling up mass drug administration for the control of soil-transmitted helminths: a comparison of cost function and constant costs analyses.</style>