Restriction
Eligibility criteria for study participation is limited to specified categories of a confounder (e.g., between the ages of 25 and 35, women only).
Specified categories of a confounder (e.g., between the ages of 25 and 35, women only).
Eligibility criteria for study participation is limited to specified categories of a confounder (e.g., between the ages of 25 and 35, women only).
Specified categories of a confounder (e.g., between the ages of 25 and 35, women only).