National monitoring of iodine, sodium, and vitamin D status in toddlers and women of childbearing age – results and lessons learned from a pilot study in Norway

Background: Norway is lacking a population-based national monitoring program for iodine, sodium, and vitamin D status. Objective: The aim of this study was to pilot-test a study design for collecting biological samples from a coun- try-representative sample of 2-year-old children and their mothers and to report results for iodine, salt, and vitamin D at baseline, before initiation of salt iodization in Norway. Design: In a cross-sectional study, we recruited 2-year-old children and their...