Urine sample collection. A 10-mL urine sample was collected from
women (15–49 y old) and SAC (6–11 y old) for urinary iodine
measurements. The participants were provided with a prelabeled 30-mL
urine collection tube and asked to provide a urine sample. Upon receiving
the urine sample, the tubewas placed into a cool box and transported back
to the base at the end of the day. Sheets of preprinted identification number
labels were used for labeling of all biologic samples to enable robust
linking of the laboratory results with questionnaire data.